diff --git a/.gitattributes b/.gitattributes
index 61c19cd..319afb0 100644
--- a/.gitattributes
+++ b/.gitattributes
@@ -6,13 +6,13 @@
 # https://blog.madewithlove.be/post/gitattributes/
 #
 /.gitattributes export-ignore
+/.github export-ignore
 /.gitignore export-ignore
-/.travis.yml export-ignore
+/.github/ export-ignore
 /appveyor.yml export-ignore
 /box.json export-ignore
 /doc export-ignore
 /phpcs.xml.dist export-ignore
-/phpcs-ruleset.xml export-ignore
 /tests export-ignore
 
 #
diff --git a/.github/workflows/release.yml b/.github/workflows/release.yml
new file mode 100644
index 0000000..e1e1cd8
--- /dev/null
+++ b/.github/workflows/release.yml
@@ -0,0 +1,119 @@
+name: Build and test phar
+
+on:
+  push:
+    tags:
+      - 'v*'
+  # Allow manually triggering the workflow.
+  workflow_dispatch:
+
+jobs:
+  bundle:
+    name: Bundle binary
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v2
+
+      - name: Setup PHP
+        uses: shivammathur/setup-php@v2
+        with:
+          php-version: 5.4
+          extensions: exif, phar, openssl
+          coverage: none
+          ini-values: phar.readonly=Off
+
+      - name: Install Box from GitHub
+        run: |
+          curl -LSs https://box-project.github.io/box2/installer.php | php
+          test -f ./box.phar
+          test -d ~/bin || mkdir ~/bin
+          mv ./box.phar ~/bin/box
+          ~/bin/box -V
+          echo "$HOME/bin" >> $GITHUB_PATH
+
+      - name: Install Composer dependencies
+        uses: ramsey/composer-install@v1
+        with:
+          composer-options: "--no-dev"
+
+      - name: Building binary...
+        run: box build -v
+
+      - uses: actions/upload-artifact@v2
+        with:
+          name: parallel-lint-phar
+          path: ./parallel-lint.phar
+
+  verify:
+    name: Validate binary on PHP ${{ matrix.php }}
+    runs-on: ubuntu-latest
+    continue-on-error: ${{ matrix.experimental == true }}
+    needs:
+      - bundle
+
+    strategy:
+      matrix:
+        php:
+          - '5.4'
+          - '5.5'
+          - '5.6'
+          - '7.0'
+          - '7.1'
+          - '7.2'
+          - '7.3'
+          - '7.4'
+          - '8.0'
+          - '8.1'
+
+        include:
+          - php: '8.1'
+            experimental: true
+
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v2
+
+      - uses: actions/download-artifact@v2
+        with:
+          name: parallel-lint-phar
+
+      - name: Setup PHP
+        uses: shivammathur/setup-php@v2
+        with:
+          php-version: ${{ matrix.php }}
+          coverage: none
+
+      - name: Run linter against codebase
+        run: php ./parallel-lint.phar src/
+
+  publish:
+    name: Add binary to release
+    runs-on: ubuntu-latest
+    needs:
+      - bundle
+      - verify
+
+    steps:
+      - uses: actions/download-artifact@v2
+        with:
+          name: parallel-lint-phar
+
+      - name: Draft Release
+        uses: actions/create-release@v1
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+        with:
+          tag_name: ${{ github.ref }}
+          release_name: Release ${{ github.ref }}
+          draft: true
+          prerelease: false
+
+      - name: Upload Phar as Release Asset
+        id: upload-release-asset
+        uses: softprops/action-gh-release@v1
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+        with:
+          files: parallel-lint.phar
diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
new file mode 100644
index 0000000..7d54101
--- /dev/null
+++ b/.github/workflows/test.yml
@@ -0,0 +1,139 @@
+name: Run unit and style tests
+
+on:
+  pull_request:
+  push:
+    branches:
+      - develop
+      - master
+  # Allow manually triggering the workflow.
+  workflow_dispatch:
+
+jobs:
+  lint:
+    name: Run style linter
+    runs-on: ubuntu-latest
+    steps:
+      - name: Setup PHP
+        uses: shivammathur/setup-php@v2
+        with:
+          php-version: '7.4'
+          coverage: none
+          tools: cs2pr
+
+      - name: Checkout code
+        uses: actions/checkout@v2
+
+      - name: Install Composer dependencies
+        uses: ramsey/composer-install@v1
+
+      - name: Run code sniffer
+        continue-on-error: true
+        run: vendor/bin/phpcs --report-full --report-checkstyle=./phpcs-report.xml
+
+      - name: Show PHPCS results in PR
+        run: cs2pr ./phpcs-report.xml
+
+  bundle:
+    name: Bundle binary
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v2
+
+      - name: Setup PHP
+        uses: shivammathur/setup-php@v2
+        with:
+          php-version: 5.4
+          extensions: exif, phar, openssl
+          coverage: none
+          ini-values: phar.readonly=Off
+
+      - name: Install Box from GitHub
+        run: |
+          curl -LSs https://box-project.github.io/box2/installer.php | php
+          test -f ./box.phar
+          test -d ~/bin || mkdir ~/bin
+          mv ./box.phar ~/bin/box
+          ~/bin/box -V
+          echo "$HOME/bin" >> $GITHUB_PATH
+
+      - name: Install Composer dependencies
+        uses: ramsey/composer-install@v1
+        with:
+          composer-options: "--no-dev"
+
+      - name: Building binary...
+        run: box build -v
+
+      - uses: actions/upload-artifact@v2
+        with:
+          name: parallel-lint-phar
+          path: ./parallel-lint.phar
+
+  test:
+    name: Run tests on PHP ${{ matrix.php }}
+    runs-on: ubuntu-latest
+    continue-on-error: ${{ matrix.experimental == true }}
+    needs:
+      - bundle
+
+    strategy:
+      matrix:
+        php:
+          - '5.3'
+          - '5.4'
+          - '5.5'
+          - '5.6'
+          - '7.0'
+          - '7.1'
+          - '7.2'
+          - '7.3'
+          - '7.4'
+          - '8.0'
+          - '8.1'
+
+        include:
+          - php: '8.1'
+            experimental: true
+
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v2
+
+      - name: Setup PHP
+        uses: shivammathur/setup-php@v2
+        with:
+          php-version: ${{ matrix.php }}
+          coverage: none
+
+      # Remove PHPCS as it has a minimum PHP requirements of PHP 5.4 and would block install on PHP 5.3.
+      - name: 'Composer: remove PHPCS'
+        if: ${{ matrix.php < 5.4 }}
+        run: composer remove --dev squizlabs/php_codesniffer --no-update
+
+      - name: Install Composer dependencies
+        uses: ramsey/composer-install@v1
+
+      - name: 'Integration test 1 - linting own code, no colors'
+        continue-on-error: true
+        run: ./parallel-lint --exclude vendor --exclude tests/examples --no-colors .
+
+      - name: 'Integration test 2 - linting own code'
+        run: ./parallel-lint --exclude vendor --exclude tests/examples .
+
+      - name: 'Run unit tests PHP <= 5.5'
+        if: ${{ matrix.php < 5.6 }}
+        run: composer testphp5
+
+      - name: 'Run unit tests PHP >= 5.6'
+        if: ${{ matrix.php >= 5.6 }}
+        run: composer test
+
+      - uses: actions/download-artifact@v2
+        with:
+          name: parallel-lint-phar
+
+      - name: Run linter against codebase using the phar
+        run: php ./parallel-lint.phar --exclude vendor --exclude tests/examples .
diff --git a/.gitignore b/.gitignore
index 8b7ef35..0822554 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,2 +1,4 @@
 /vendor
 composer.lock
+.phpcs.xml
+phpcs.xml
diff --git a/.travis.yml b/.travis.yml
deleted file mode 100644
index 8b13987..0000000
--- a/.travis.yml
+++ /dev/null
@@ -1,30 +0,0 @@
-language: php
-
-matrix:
-  include:
-    - php: 5.4
-      dist: trusty
-    - php: 5.5
-      dist: trusty
-    - php: 5.6
-    - php: 7.0
-    - php: 7.1
-    - php: 7.2
-    - php: 7.3
-    - php: 7.4
-    - php: "nightly"
-
-  fast_finish: true
-
-  allow_failures:
-    # Allow failures for unstable builds.
-    - php: "nightly"
-
-install:
-  - composer install --no-interaction --prefer-source
-
-script:
-  - ./vendor/bin/tester -p php tests
-  - ./parallel-lint --exclude vendor --exclude tests/examples --no-colors .
-  - ./parallel-lint --exclude vendor --exclude tests/examples .
-  - ./vendor/bin/phpcs --standard=phpcs-ruleset.xml -s src
diff --git a/CHANGELOG.md b/CHANGELOG.md
index e544f1b..16c15e5 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -6,6 +6,42 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/).
 
 ## [Unreleased]
 
+[Unreleased]: https://github.com/php-parallel-lint/PHP-Parallel-Lint/compare/v1.3.0...HEAD
+
+## [1.3.0] - 2021-04-07
+
+### Added
+
+- Allow for multi-part file extensions to be passed using -e (like `-e php,php.dist`) from [@jrfnl](https://github.com/jrfnl).
+- Added syntax error callback [#30](https://github.com/php-parallel-lint/PHP-Parallel-Lint/pull/30) from [@arxeiss](https://github.com/arxeiss).
+- Ignore PHP startup errors [#34](https://github.com/php-parallel-lint/PHP-Parallel-Lint/pull/34) from [@jrfnl](https://github.com/jrfnl).
+- Restore php 5.3 support [#51](https://github.com/php-parallel-lint/PHP-Parallel-Lint/pull/51) from [@glensc](https://github.com/glensc).
+
+### Fixed
+
+- Determine skip lint process failure by status code instead of stderr content [#48](https://github.com/php-parallel-lint/PHP-Parallel-Lint/pull/48) from [@jankonas](https://github.com/jankonas).
+
+### Changed
+
+- Improve wording in the readme [#52](https://github.com/php-parallel-lint/PHP-Parallel-Lint/pull/52) from [@glensc](https://github.com/glensc).
+
+### Internal
+
+- Normalized composer.json from [@OndraM](https://github.com/OndraM).
+- Updated PHPCS dependency from [@jrfnl](https://github.com/jrfnl).
+- Cleaned coding style from [@jrfnl](https://github.com/jrfnl).
+- Provide one true way to run the test suite [#37](https://github.com/php-parallel-lint/PHP-Parallel-Lint/pull/37) from [@mfn](https://github.com/mfn).
+- Travis: add build against PHP 8.0 and fix failing test [#41](https://github.com/php-parallel-lint/PHP-Parallel-Lint/pull/41) from [@jrfnl](https://github.com/jrfnl).
+- GitHub Actions for testing, and automatic phar creation [#46](https://github.com/php-parallel-lint/PHP-Parallel-Lint/pull/46) from [@roelofr](https://github.com/roelofr).
+- Add .github folder to .gitattributes export-ignore [#54](https://github.com/php-parallel-lint/PHP-Parallel-Lint/pull/54) from [@glensc](https://github.com/glensc).
+- Suggest to curl composer install via HTTPS [#53](https://github.com/php-parallel-lint/PHP-Parallel-Lint/pull/53) from [@reedy](https://github.com/reedy).
+- GH Actions: allow for manually triggering a workflow [#55](https://github.com/php-parallel-lint/PHP-Parallel-Lint/pull/55) from [@jrfnl](https://github.com/jrfnl).
+- GH Actions: fix phar creation [#55](https://github.com/php-parallel-lint/PHP-Parallel-Lint/pull/55) from [@jrfnl](https://github.com/jrfnl).
+- GH Actions: run the tests against all supported PHP versions [#55](https://github.com/php-parallel-lint/PHP-Parallel-Lint/pull/55) from [@jrfnl](https://github.com/jrfnl).
+- GH Actions: report CS violations in the PR [#55](https://github.com/php-parallel-lint/PHP-Parallel-Lint/pull/55) from [@jrfnl](https://github.com/jrfnl).
+
+[1.3.0]: https://github.com/php-parallel-lint/PHP-Parallel-Lint/compare/v1.2.0...v1.3.0
+
 ## [1.2.0] - 2020-04-04
 
 ### Added
@@ -26,3 +62,5 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/).
 - Added info about installing like not a dependency.
 - Cleaned readme - new organization from previous package.
 - Added checklist for new version from [@szepeviktor](https://github.com/szepeviktor).
+
+[1.2.0]: https://github.com/php-parallel-lint/PHP-Parallel-Lint/compare/v1.1.0...v1.2.0
diff --git a/README.md b/README.md
index 446428d..e5c762f 100644
--- a/README.md
+++ b/README.md
@@ -1,36 +1,39 @@
 # PHP Parallel Lint
 
 [![Downloads this Month](https://img.shields.io/packagist/dm/php-parallel-lint/php-parallel-lint.svg)](https://packagist.org/packages/php-parallel-lint/php-parallel-lint)
-[![Build Status](https://travis-ci.org/php-parallel-lint/PHP-Parallel-Lint.svg?branch=master)](https://travis-ci.org/php-parallel-lint/PHP-Parallel-Lint)
+[![Build Status](https://github.com/php-parallel-lint/PHP-Parallel-Lint/actions/workflows/test.yml/badge.svg)](https://github.com/php-parallel-lint/PHP-Parallel-Lint/actions/workflows/test.yml)
 [![License](https://poser.pugx.org/php-parallel-lint/php-parallel-lint/license.svg)](https://packagist.org/packages/php-parallel-lint/php-parallel-lint)
 
-This tool checks syntax of PHP files faster than serial check with a fancier output.
+This application checks syntax of PHP files in parallel.
+It can output in plain text, colored text, json and checksyntax formats.
+Additionally `blame` can be used to show commits that introduced the breakage.
+
 Running parallel jobs in PHP is inspired by Nette framework tests.
 
-This works from PHP 5.4 to 7.4
+The application is officially supported for use with PHP 5.3 to 8.0.
 
 ## Table of contents
 
 1. [Installation](#installation)
 2. [Example output](#example-output)
-3. [Fork](#fork)
-4. [Options for run](#options-for-run)
-5. [Options for Symfony](#recommended-setting-for-usage-with-symfony-framework)
+3. [History](#history)
+4. [Command line options](#command-line-options)
+5. [Recommended excludes for Symfony framework](#recommended-excludes-for-symfony-framework)
 6. [Create Phar package](#create-phar-package)
-7. [How upgrade](#how-upgrade)
+7. [How to upgrade](#how-to-upgrade)
 
 ## Installation
 
-Just run the following command to install it:
+Install with `composer` as development dependency:
 
     composer require --dev php-parallel-lint/php-parallel-lint
 
-When you cannot use tool as dependency then you can install as project. Command for it:
+Alternatively you can install as a standalone `composer` project:
 
     composer create-project php-parallel-lint/php-parallel-lint /path/to/folder/php-parallel-lint
     /path/to/folder/php-parallel-lint/parallel-lint # running tool
 
-For colored output also install the suggested package `php-parallel-lint/php-console-highlighter`:
+For colored output, install the suggested package `php-parallel-lint/php-console-highlighter`:
 
     composer require --dev php-parallel-lint/php-console-highlighter
 
@@ -39,37 +42,51 @@ For colored output also install the suggested package `php-parallel-lint/php-con
 ![Example use of tool with error](/tests/examples/example-images/use-error.png?raw=true "Example use of tool with error")
 
 
-## Fork
-This is a fork of [original project](https://github.com/JakubOnderka/PHP-Parallel-Lint). Why I forked it and why I am the right man?
+## History
+
+This project was originally created by [@JakubOnderka] and released as
+[jakub-onderka/php-parallel-lint].
+
+Since then, Jakub has moved on to other interests and as of January 2020, the
+second most active maintainer [@grogy] has taken over maintenance of the project
+and given the project - and related dependencies - a new home in the PHP
+Parallel Lint organisation.
+
+It is strongly recommended for existing users of the (unmaintained)
+[jakub-onderka/php-parallel-lint] package to switch their dependency to
+[php-parallel-lint/php-parallel-lint], see [How to upgrade](#how-to-upgrade) below.
 
-- Project is used in many and projects.
-- I am [second most active](https://github.com/JakubOnderka/PHP-Parallel-Lint/graphs/contributors) contributor in original project.
-- Author does [not responds to issues and PRs](https://github.com/JakubOnderka/PHP-Parallel-Lint/pulls) and my mail messages.
+[php-parallel-lint/php-parallel-lint]: https://github.com/php-parallel-lint/PHP-Parallel-Lint
+[grogy/php-parallel-lint]: https://github.com/grogy/PHP-Parallel-Lint
+[jakub-onderka/php-parallel-lint]: https://github.com/JakubOnderka/PHP-Parallel-Lint
+[@JakubOnderka]: https://github.com/JakubOnderka
+[@grogy]: https://github.com/grogy
 
-## Options for run
+## Command line options
 
-- `-p <php>`        Specify PHP-CGI executable to run (default: 'php').
-- `-s, --short`     Set short_open_tag to On (default: Off).
-- `-a, --asp`        Set asp_tags to On (default: Off).
-- `-e <ext>`        Check only files with selected extensions separated by comma. (default: php,php3,php4,php5,phtml,phpt)
-- `--exclude`       Exclude a file or directory. If you want exclude multiple items, use multiple exclude parameters.
-- `-j <num>`        Run <num> jobs in parallel (default: 10).
-- `--colors`        Force enable colors in console output.
-- `--no-colors`     Disable colors in console output.
-- `--no-progress`   Disable progress in console output.
-- `--checkstyle`    Output results as Checkstyle XML.
-- `--json`          Output results as JSON string (require PHP 5.4).
-- `--blame`         Try to show git blame for row with error.
-- `--git <git>`     Path to Git executable to show blame message (default: 'git').
-- `--stdin`         Load files and folder to test from standard input.
-- `--ignore-fails`  Ignore failed tests.
-- `-h, --help`      Print this help.
-- `-V, --version`   Display this application version.
+- `-p <php>`        		Specify PHP-CGI executable to run (default: 'php').
+- `-s, --short`     		Set short_open_tag to On (default: Off).
+- `-a, --asp`       		Set asp_tags to On (default: Off).
+- `-e <ext>`        		Check only files with selected extensions separated by comma. (default: php,php3,php4,php5,phtml,phpt)
+- `--exclude`       		Exclude a file or directory. If you want exclude multiple items, use multiple exclude parameters.
+- `-j <num>`        		Run <num> jobs in parallel (default: 10).
+- `--colors`        		Force enable colors in console output.
+- `--no-colors`     		Disable colors in console output.
+- `--no-progress`   		Disable progress in console output.
+- `--checkstyle`    		Output results as Checkstyle XML.
+- `--json`          		Output results as JSON string (requires PHP 5.4).
+- `--blame`         		Try to show git blame for row with error.
+- `--git <git>`     		Path to Git executable to show blame message (default: 'git').
+- `--stdin`         		Load files and folder to test from standard input.
+- `--ignore-fails`  		Ignore failed tests.
+- `--syntax-error-callback` File with syntax error callback for ability to modify error, see more in [example](doc/syntax-error-callback.md)
+- `-h, --help`      		Print this help.
+- `-V, --version`   		Display this application version.
 
 
-## Recommended setting for usage with Symfony framework
+## Recommended excludes for Symfony framework
 
-For run from command line:
+To run from the command line:
 
     vendor/bin/parallel-lint --exclude app --exclude vendor .
 
@@ -81,14 +98,14 @@ PHP Parallel Lint supports [Box app](https://box-project.github.io/box2/) for cr
     curl -LSs https://box-project.github.io/box2/installer.php | php
 
 
-and then run this command in parallel lint folder, which creates `parallel-lint.phar` file.
+then run the build command in parallel lint folder, which creates `parallel-lint.phar` file.
 
 
     box build
 
-## How upgrade
+## How to upgrade
 
-Are you using original package? You can easy use this fork. Steps for upgrade are:
+Are you using `jakub-onderka/php-parallel-lint` package? You can switch to `php-parallel-lint/php-parallel-lint` using:
 
     composer remove --dev jakub-onderka/php-parallel-lint
     composer require --dev php-parallel-lint/php-parallel-lint
diff --git a/appveyor.yml b/appveyor.yml
index 08bdae4..15ae250 100644
--- a/appveyor.yml
+++ b/appveyor.yml
@@ -25,6 +25,6 @@ install:
   - php composer.phar install --prefer-source --no-interaction
 
 test_script:
-  - vendor\bin\tester tests -p php
+  - php composer.phar test
   - php parallel-lint --exclude vendor --exclude tests\examples --no-colors .
   - php parallel-lint --exclude vendor --exclude tests\examples .
diff --git a/box.json b/box.json
index 951802d..8c6fc81 100644
--- a/box.json
+++ b/box.json
@@ -5,7 +5,7 @@
         "Herrera\\Box\\Compactor\\Php"
     ],
     "extract": false,
-    "main": "parallel-lint.php",
+    "main": "parallel-lint",
     "files": [
         "LICENSE"
     ],
diff --git a/composer.json b/composer.json
index 3c90b69..ce7ed04 100644
--- a/composer.json
+++ b/composer.json
@@ -3,32 +3,44 @@
     "description": "This tool check syntax of PHP files about 20x faster than serial check.",
     "homepage": "https://github.com/php-parallel-lint/PHP-Parallel-Lint",
     "license": "BSD-2-Clause",
+    "authors": [
+        {
+            "name": "Jakub Onderka",
+            "email": "ahoj@jakubonderka.cz"
+        }
+    ],
     "require": {
-        "php": ">=5.4.0",
+        "php": ">=5.3.0",
         "ext-json": "*"
     },
+    "replace": {
+        "grogy/php-parallel-lint": "*",
+        "jakub-onderka/php-parallel-lint": "*"
+    },
     "require-dev": {
         "nette/tester": "^1.3 || ^2.0",
         "php-parallel-lint/php-console-highlighter": "~0.3",
-        "squizlabs/php_codesniffer": "~3.0"
+        "squizlabs/php_codesniffer": "^3.5"
     },
     "suggest": {
         "php-parallel-lint/php-console-highlighter": "Highlight syntax in code snippet"
     },
-    "authors": [
-        {
-            "name": "Jakub Onderka",
-            "email": "ahoj@jakubonderka.cz"
-        }
-    ],
+    "config": {
+        "sort-packages": true
+    },
     "autoload": {
         "classmap": [
             "./"
         ]
     },
-    "bin": ["parallel-lint"],
-    "replace": {
-        "jakub-onderka/php-parallel-lint": "*",
-        "grogy/php-parallel-lint": "*"
+    "bin": [
+        "parallel-lint"
+    ],
+    "scripts": {
+        "test": "@php vendor/bin/tester -C -p php tests",
+        "testphp5": "@php vendor/bin/tester -p php tests"
+    },
+    "scripts-descriptions": {
+        "test": "Run all tests!"
     }
 }
diff --git a/doc/syntax-error-callback.md b/doc/syntax-error-callback.md
new file mode 100644
index 0000000..955f5ef
--- /dev/null
+++ b/doc/syntax-error-callback.md
@@ -0,0 +1,31 @@
+# Syntax Error Callback
+
+1. Set a path to a file with custom error callback to `--syntax-error-callback` option.
+1. Create a class implementing `JakubOnderka\PhpParallelLint\Contracts\SyntaxErrorCallback` interface. File with the class must have the same name as the class inside.
+1. Modify error before it is printed to the output.
+
+## Example configuration
+
+File `MyCustomErrorHandler.php` will be passed as an argument like `./parallel-lint --syntax-error-callback ./path/to/MyCustomErrorHandler.php .`.<br>
+The content should look like:
+
+```php
+
+use JakubOnderka\PhpParallelLint\Contracts\SyntaxErrorCallback;
+use JakubOnderka\PhpParallelLint\SyntaxError;
+
+class MyCustomErrorHandler implements SyntaxErrorCallback {
+	/**
+     * @param SyntaxError $error
+     * @return SyntaxError
+     */
+    public function errorFound(SyntaxError $error){
+    	// Return new SyntaxError with custom modification to FilePath or Message
+    	// Or return custom implementation of SyntaxError extending the original one...
+    	return new SyntaxError(
+    		$error->getFilePath(),
+    		$error->getMessage()
+    	);
+    }
+}
+```
diff --git a/parallel-lint b/parallel-lint
index 0d77fdb..f44e110 100755
--- a/parallel-lint
+++ b/parallel-lint
@@ -30,19 +30,19 @@ of the authors and should not be interpreted as representing official policies,
 either expressed or implied, of the FreeBSD Project.
  */
 
-if (!defined('PHP_VERSION_ID') || PHP_VERSION_ID < 50400) {
-    fwrite(STDERR, "PHP Parallel Lint require PHP 5.4.0 or newer." . PHP_EOL);
+if (!defined('PHP_VERSION_ID') || PHP_VERSION_ID < 50300) {
+    fwrite(STDERR, "PHP Parallel Lint requires PHP 5.3.0 or newer." . PHP_EOL);
     exit(254);
 }
 
-$autoloadLocations = [
+$autoloadLocations = array(
     getcwd() . '/vendor/autoload.php',
     getcwd() . '/../../autoload.php',
     __DIR__ . '/vendor/autoload.php',
     __DIR__ . '/../vendor/autoload.php',
     __DIR__ . '/../../../autoload.php',
     __DIR__ . '/../../autoload.php',
-];
+);
 
 $loaded = false;
 foreach ($autoloadLocations as $autoload) {
@@ -55,11 +55,13 @@ foreach ($autoloadLocations as $autoload) {
 if (!$loaded) {
     fwrite(STDERR,
         'You must set up the project dependencies, run the following commands:' . PHP_EOL .
-        'curl -s http://getcomposer.org/installer | php' . PHP_EOL .
+        'curl -s https://getcomposer.org/installer | php' . PHP_EOL .
         'php composer.phar install' . PHP_EOL
     );
     exit(254);
 }
 
+require_once __DIR__ . '/src/polyfill.php';
+
 $app = new JakubOnderka\PhpParallelLint\Application();
 exit($app->run());
diff --git a/phpcs-ruleset.xml b/phpcs.xml.dist
similarity index 66%
rename from phpcs-ruleset.xml
rename to phpcs.xml.dist
index 8d730a6..e84650a 100644
--- a/phpcs-ruleset.xml
+++ b/phpcs.xml.dist
@@ -1,7 +1,38 @@
 <?xml version="1.0"?>
-<ruleset name="PHP-Parallel-Lint">
+<ruleset xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" name="PHP-Parallel-Lint" xsi:noNamespaceSchemaLocation="./vendor/squizlabs/php_codesniffer/phpcs.xsd">
     <description>PHP Parallel Lint coding standard.</description>
 
+    <!--
+    #############################################################################
+    COMMAND LINE ARGUMENTS
+    https://github.com/squizlabs/PHP_CodeSniffer/wiki/Annotated-ruleset.xml
+    #############################################################################
+    -->
+
+    <file>.</file>
+
+    <!-- Exclude the Examples directory and the Composer vendor directory. -->
+    <exclude-pattern>*/tests/examples/*</exclude-pattern>
+    <exclude-pattern>*/vendor/*</exclude-pattern>
+
+    <!-- Only check PHP files. -->
+    <arg name="extensions" value="php,phpt/php"/>
+
+    <!-- Show progress, show the error codes for each message (source). -->
+    <arg value="ps"/>
+
+    <!-- Strip the filepaths down to the relevant bit. -->
+    <arg name="basepath" value="./"/>
+
+    <!-- Check up to 8 files simultaneously. -->
+    <arg name="parallel" value="8"/>
+
+    <!--
+    #############################################################################
+    RULES
+    #############################################################################
+    -->
+
     <rule ref="Generic.Functions.FunctionCallArgumentSpacing"/>
     <rule ref="Generic.Functions.OpeningFunctionBraceBsdAllman"/>
     <rule ref="PEAR.Functions.FunctionDeclaration"/>
@@ -20,7 +51,9 @@
 
     <rule ref="Generic.PHP.DisallowShortOpenTag"/>
     <rule ref="Generic.PHP.LowerCaseConstant"/>
-    <rule ref="Generic.PHP.NoSilencedErrors"/>
+    <rule ref="Generic.PHP.NoSilencedErrors">
+        <exclude-pattern>/bin/skip-linting\.php$</exclude-pattern>
+    </rule>
     <rule ref="Squiz.PHP.GlobalKeyword"/>
     <rule ref="Squiz.PHP.LowercasePHPFunctions"/>
     <rule ref="Squiz.PHP.NonExecutableCode"/>
diff --git a/src/Application.php b/src/Application.php
index 4517083..d38e42d 100644
--- a/src/Application.php
+++ b/src/Application.php
@@ -4,7 +4,7 @@
 
 class Application
 {
-    const VERSION = '1.2.0';
+    const VERSION = '1.3.0';
 
     // Return codes
     const SUCCESS = 0,
@@ -75,25 +75,26 @@ private function showOptions()
     {
         echo <<<HELP
 Options:
-    -p <php>        Specify PHP-CGI executable to run (default: 'php').
-    -s, --short     Set short_open_tag to On (default: Off).
-    -a, -asp        Set asp_tags to On (default: Off).
-    -e <ext>        Check only files with selected extensions separated by comma.
-                    (default: php,php3,php4,php5,phtml,phpt)
-    --exclude       Exclude a file or directory. If you want exclude multiple items,
-                    use multiple exclude parameters.
-    -j <num>        Run <num> jobs in parallel (default: 10).
-    --colors        Enable colors in console output. (disables auto detection of color support)
-    --no-colors     Disable colors in console output.
-    --no-progress   Disable progress in console output.
-    --json          Output results as JSON string.
-    --checkstyle    Output results as Checkstyle XML.
-    --blame         Try to show git blame for row with error.
-    --git <git>     Path to Git executable to show blame message (default: 'git').
-    --stdin         Load files and folder to test from standard input.
-    --ignore-fails  Ignore failed tests.
-    -h, --help      Print this help.
-    -V, --version   Display this application version
+    -p <php>                Specify PHP-CGI executable to run (default: 'php').
+    -s, --short             Set short_open_tag to On (default: Off).
+    -a, -asp                Set asp_tags to On (default: Off).
+    -e <ext>                Check only files with selected extensions separated by comma.
+                            (default: php,php3,php4,php5,phtml,phpt)
+    --exclude               Exclude a file or directory. If you want exclude multiple items,
+                            use multiple exclude parameters.
+    -j <num>                Run <num> jobs in parallel (default: 10).
+    --colors                Enable colors in console output. (disables auto detection of color support)
+    --no-colors             Disable colors in console output.
+    --no-progress           Disable progress in console output.
+    --json                  Output results as JSON string.
+    --checkstyle            Output results as Checkstyle XML.
+    --blame                 Try to show git blame for row with error.
+    --git <git>             Path to Git executable to show blame message (default: 'git').
+    --stdin                 Load files and folder to test from standard input.
+    --ignore-fails          Ignore failed tests.
+    --syntax-error-callback File with syntax error callback for ability to modify error
+    -h, --help              Print this help.
+    -V, --version           Display this application version
 
 HELP;
     }
diff --git a/src/Contracts/SyntaxErrorCallback.php b/src/Contracts/SyntaxErrorCallback.php
new file mode 100644
index 0000000..0db055f
--- /dev/null
+++ b/src/Contracts/SyntaxErrorCallback.php
@@ -0,0 +1,13 @@
+<?php
+namespace JakubOnderka\PhpParallelLint\Contracts;
+
+use JakubOnderka\PhpParallelLint\SyntaxError;
+
+interface SyntaxErrorCallback
+{
+    /**
+     * @param SyntaxError $error
+     * @return SyntaxError
+     */
+    public function errorFound(SyntaxError $error);
+}
diff --git a/src/Manager.php b/src/Manager.php
index abb6024..63091b1 100644
--- a/src/Manager.php
+++ b/src/Manager.php
@@ -1,6 +1,7 @@
 <?php
 namespace JakubOnderka\PhpParallelLint;
 
+use JakubOnderka\PhpParallelLint\Contracts\SyntaxErrorCallback;
 use JakubOnderka\PhpParallelLint\Process\GitBlameProcess;
 use JakubOnderka\PhpParallelLint\Process\PhpExecutable;
 
@@ -38,6 +39,7 @@ public function run(Settings $settings = null)
         $parallelLint->setAspTagsEnabled($settings->aspTags);
         $parallelLint->setShortTagEnabled($settings->shortTag);
         $parallelLint->setShowDeprecated($settings->showDeprecated);
+        $parallelLint->setSyntaxErrorCallback($this->createSyntaxErrorCallback($settings));
 
         $parallelLint->setProcessCallback(function ($status, $file) use ($output) {
             if ($status === ParallelLint::STATUS_OK) {
@@ -134,7 +136,8 @@ protected function gitBlame(Result $result, Settings $settings)
      */
     protected function getFilesFromPaths(array $paths, array $extensions, array $excluded = array())
     {
-        $extensions = array_flip($extensions);
+        $extensions = array_map('preg_quote', $extensions, array_fill(0, count($extensions), '`'));
+        $regex = '`\.(?:' . implode('|', $extensions) . ')$`iD';
         $files = array();
 
         foreach ($paths as $path) {
@@ -151,11 +154,11 @@ protected function getFilesFromPaths(array $paths, array $extensions, array $exc
                     \RecursiveIteratorIterator::CATCH_GET_CHILD
                 );
 
+                $iterator = new \RegexIterator($iterator, $regex);
+
                 /** @var \SplFileInfo[] $iterator */
                 foreach ($iterator as $directoryFile) {
-                    if (isset($extensions[pathinfo($directoryFile->getFilename(), PATHINFO_EXTENSION)])) {
-                        $files[] = (string) $directoryFile;
-                    }
+                    $files[] = (string) $directoryFile;
                 }
             } else {
                 throw new NotExistsPathException($path);
@@ -166,6 +169,33 @@ protected function getFilesFromPaths(array $paths, array $extensions, array $exc
 
         return $files;
     }
+
+    protected function createSyntaxErrorCallback(Settings $settings)
+    {
+        if ($settings->syntaxErrorCallbackFile === null) {
+            return null;
+        }
+
+        $fullFilePath = realpath($settings->syntaxErrorCallbackFile);
+        if ($fullFilePath === false) {
+            throw new NotExistsPathException($settings->syntaxErrorCallbackFile);
+        }
+
+        require_once $fullFilePath;
+
+        $expectedClassName = basename($fullFilePath, '.php');
+        if (!class_exists($expectedClassName)) {
+            throw new NotExistsClassException($expectedClassName, $settings->syntaxErrorCallbackFile);
+        }
+
+        $callbackInstance = new $expectedClassName;
+
+        if (!($callbackInstance instanceof SyntaxErrorCallback)) {
+            throw new NotImplementCallbackException($expectedClassName);
+        }
+
+        return $callbackInstance;
+    }
 }
 
 class RecursiveDirectoryFilterIterator extends \RecursiveFilterIterator
diff --git a/src/ParallelLint.php b/src/ParallelLint.php
index 8c12a73..b1825f3 100644
--- a/src/ParallelLint.php
+++ b/src/ParallelLint.php
@@ -1,6 +1,7 @@
 <?php
 namespace JakubOnderka\PhpParallelLint;
 
+use JakubOnderka\PhpParallelLint\Contracts\SyntaxErrorCallback;
 use JakubOnderka\PhpParallelLint\Process\LintProcess;
 use JakubOnderka\PhpParallelLint\Process\PhpExecutable;
 use JakubOnderka\PhpParallelLint\Process\SkipLintProcess;
@@ -30,6 +31,9 @@ class ParallelLint
     /** @var bool */
     private $showDeprecated = false;
 
+    /** @var SyntaxErrorCallback|null */
+    private $syntaxErrorCallback = null;
+
     public function __construct(PhpExecutable $phpExecutable, $parallelJobs = 10)
     {
         $this->phpExecutable = $phpExecutable;
@@ -92,7 +96,7 @@ public function lint(array $files)
 
                     } else if ($process->containsError()) {
                         $checkedFiles[] = $file;
-                        $errors[] = new SyntaxError($file, $process->getSyntaxError());
+                        $errors[] = $this->triggerSyntaxErrorCallback(new SyntaxError($file, $process->getSyntaxError()));
                         $processCallback(self::STATUS_ERROR, $file);
 
                     } else if ($process->isSuccess()) {
@@ -111,7 +115,7 @@ public function lint(array $files)
         if (!empty($waiting)) {
             $skipLintProcess->waitForFinish();
 
-            if ($skipLintProcess->getErrorOutput()) {
+            if ($skipLintProcess->isFail()) {
                 $message = "Error in skip-linting.php process\nError output: {$skipLintProcess->getErrorOutput()}";
                 throw new \Exception($message);
             }
@@ -131,7 +135,7 @@ public function lint(array $files)
 
                 } else if ($process->containsError()) {
                     $checkedFiles[] = $file;
-                    $errors[] = new SyntaxError($file, $process->getSyntaxError());
+                    $errors[] = $this->triggerSyntaxErrorCallback(new SyntaxError($file, $process->getSyntaxError()));
                     $processCallback(self::STATUS_ERROR, $file);
 
                 } else {
@@ -259,4 +263,24 @@ public function setShowDeprecated($showDeprecated)
 
         return $this;
     }
+
+    public function triggerSyntaxErrorCallback($syntaxError)
+    {
+        if ($this->syntaxErrorCallback === null) {
+            return $syntaxError;
+        }
+
+        return $this->syntaxErrorCallback->errorFound($syntaxError);
+    }
+
+    /**
+     * @param SyntaxErrorCallback|null $syntaxErrorCallback
+     * @return ParallelLint
+     */
+    public function setSyntaxErrorCallback($syntaxErrorCallback)
+    {
+        $this->syntaxErrorCallback = $syntaxErrorCallback;
+
+        return $this;
+    }
 }
diff --git a/src/Process/PhpProcess.php b/src/Process/PhpProcess.php
index de9eee1..0df293a 100644
--- a/src/Process/PhpProcess.php
+++ b/src/Process/PhpProcess.php
@@ -23,8 +23,11 @@ public function __construct(PhpExecutable $phpExecutable, array $parameters = ar
      */
     private function constructParameters(array $parameters, $isHhvm)
     {
+        // Always ignore PHP startup errors ("Unable to load library...") in sub-processes.
+        array_unshift($parameters, '-d display_startup_errors=0');
+
         if ($isHhvm) {
-            $parameters = array_merge(array('-php'), $parameters);
+            array_unshift($parameters, '-php');
         }
 
         return $parameters;
diff --git a/src/Settings.php b/src/Settings.php
index 24071af..3e03a71 100644
--- a/src/Settings.php
+++ b/src/Settings.php
@@ -103,6 +103,12 @@ class Settings
      */
     public $showDeprecated = false;
 
+    /**
+     * Path to a file with syntax error callback
+     * @var string|null
+     */
+    public $syntaxErrorCallbackFile = null;
+
     /**
      * @param array $paths
      */
@@ -197,6 +203,10 @@ public static function parseArguments(array $arguments)
                         $settings->showDeprecated = true;
                         break;
 
+                    case '--syntax-error-callback':
+                        $settings->syntaxErrorCallbackFile = $arguments->getNext();
+                        break;
+
                     default:
                         throw new InvalidArgumentException($argument);
                 }
diff --git a/src/exceptions.php b/src/exceptions.php
index fd47ddc..3893b83 100644
--- a/src/exceptions.php
+++ b/src/exceptions.php
@@ -49,3 +49,42 @@ public function getPath()
         return $this->path;
     }
 }
+
+class NotExistsClassException extends Exception
+{
+    protected $className;
+    protected $fileName;
+
+    public function __construct($className, $fileName)
+    {
+        $this->className = $className;
+        $this->fileName = $fileName;
+        $this->message = "Class with name '$className' does not exists in file '$fileName'";
+    }
+
+    public function getClassName()
+    {
+        return $this->className;
+    }
+
+    public function getFileName()
+    {
+        return $this->fileName;
+    }
+}
+
+class NotImplementCallbackException extends Exception
+{
+    protected $className;
+
+    public function __construct($className)
+    {
+        $this->className = $className;
+        $this->message = "Class '$className' does not implement SyntaxErrorCallback interface.";
+    }
+
+    public function getClassName()
+    {
+        return $this->className;
+    }
+}
diff --git a/src/polyfill.php b/src/polyfill.php
new file mode 100644
index 0000000..79b3049
--- /dev/null
+++ b/src/polyfill.php
@@ -0,0 +1,15 @@
+<?php
+
+/**
+ * Polyfill for PHP < 5.4
+ */
+if (!interface_exists('JsonSerializable', false)) {
+    interface JsonSerializable
+    {
+        /**
+         * @param void
+         * @return mixed
+         */
+        function jsonSerialize();
+    }
+}
diff --git a/tests/Manager.run.phpt b/tests/Manager.run.phpt
index 169608c..65789dd 100644
--- a/tests/Manager.run.phpt
+++ b/tests/Manager.run.phpt
@@ -19,7 +19,7 @@ class ManagerRunTest extends Tester\TestCase
         $settings = $this->prepareSettings();
         $settings->paths = array('path/for-not-found/');
         $manager = $this->getManager($settings);
-        Assert::exception(function() use ($manager, $settings) {
+        Assert::exception(function () use ($manager, $settings) {
             $manager->run($settings);
         }, 'JakubOnderka\PhpParallelLint\NotExistsPathException');
     }
@@ -29,7 +29,7 @@ class ManagerRunTest extends Tester\TestCase
         $settings = $this->prepareSettings();
         $settings->paths = array('examples/example-01/');
         $manager = $this->getManager($settings);
-        Assert::exception(function() use ($manager, $settings) {
+        Assert::exception(function () use ($manager, $settings) {
             $manager->run($settings);
         }, 'JakubOnderka\PhpParallelLint\Exception', 'No file found to check.');
     }
@@ -88,6 +88,23 @@ class ManagerRunTest extends Tester\TestCase
         Assert::false($result->hasError());
     }
 
+    /**
+     * Note: the `example.php-dist` file contains a parse error.
+     * With multi-part extensions being escaped before being used in the RegexIterator,
+     * this file will not be included in the scan and the test will pass.
+     */
+    public function testMultiPartExtensions()
+    {
+        $settings = $this->prepareSettings();
+        $settings->paths = array('examples/example-06/');
+
+        $settings->extensions = array('php', 'php.dist');
+
+        $manager = $this->getManager($settings);
+        $result = $manager->run($settings);
+        Assert::false($result->hasError());
+    }
+
     /**
      * @param Settings $settings
      * @return Manager
diff --git a/tests/ParallelLint.lint.phpt b/tests/ParallelLint.lint.phpt
index b42a044..4ed584c 100644
--- a/tests/ParallelLint.lint.phpt
+++ b/tests/ParallelLint.lint.phpt
@@ -101,8 +101,8 @@ class ParallelLintLintTest extends Tester\TestCase
         Assert::false($result->hasSyntaxError());
         Assert::equal(0, count($result->getErrors()));
 
-        if (PHP_VERSION_ID < 70000) {
-            Tester\Environment::skip('test for php version > 7.0');
+        if (PHP_VERSION_ID < 70000 || PHP_VERSION_ID >= 80000 ) {
+            Tester\Environment::skip('test for php version 7.0-7.4');
         }
 
         $parallelLint = new ParallelLint($this->getPhpExecutable());
diff --git a/tests/Settings.parseArguments.phpt b/tests/Settings.parseArguments.phpt
index 60aa7c6..0a83673 100644
--- a/tests/Settings.parseArguments.phpt
+++ b/tests/Settings.parseArguments.phpt
@@ -27,6 +27,7 @@ class SettingsParseArgumentsTest extends Tester\TestCase
         $expectedSettings->colors = Settings::AUTODETECT;
         $expectedSettings->showProgress = true;
         $expectedSettings->format = Settings::FORMAT_TEXT;
+        $expectedSettings->syntaxErrorCallbackFile = null;
 
         Assert::equal($expectedSettings->shortTag, $settings->shortTag);
         Assert::equal($expectedSettings->aspTags, $settings->aspTags);
@@ -37,6 +38,7 @@ class SettingsParseArgumentsTest extends Tester\TestCase
         Assert::equal($expectedSettings->colors, $settings->colors);
         Assert::equal($expectedSettings->showProgress, $settings->showProgress);
         Assert::equal($expectedSettings->format, $settings->format);
+        Assert::equal($expectedSettings->syntaxErrorCallbackFile, $settings->syntaxErrorCallbackFile);
     }
 
     public function testMoreArguments()
@@ -108,6 +110,30 @@ class SettingsParseArgumentsTest extends Tester\TestCase
         $settings = Settings::parseArguments($argv);
         Assert::equal(Settings::FORMAT_CHECKSTYLE, $settings->format);
     }
+
+    public function testExtensions()
+    {
+        $commandLine = './parallel-lint -e php,php.dist,phpt .';
+        $argv = explode(" ", $commandLine);
+        $settings = Settings::parseArguments($argv);
+
+        $expectedSettings = new Settings();
+        $expectedSettings->extensions    = array('php', 'php.dist', 'phpt');
+
+        Assert::equal($expectedSettings->extensions, $settings->extensions);
+    }
+
+    public function testFailCallaback()
+    {
+        $commandLine = "./parallel-lint --syntax-error-callback ./path/to/my_custom_callback_file.php .";
+        $argv = explode(" ", $commandLine);
+        $settings = Settings::parseArguments($argv);
+
+        $expectedSettings = new Settings();
+        $expectedSettings->syntaxErrorCallbackFile = "./path/to/my_custom_callback_file.php";
+
+        Assert::equal($expectedSettings->syntaxErrorCallbackFile, $settings->syntaxErrorCallbackFile);
+    }
 }
 
 $testCase = new SettingsParseArgumentsTest;
diff --git a/tests/examples/example-06/example.php b/tests/examples/example-06/example.php
new file mode 100644
index 0000000..2186cb4
--- /dev/null
+++ b/tests/examples/example-06/example.php
@@ -0,0 +1,4 @@
+<?php
+
+$myInteger = 100;
+echo $myInteger;
diff --git a/tests/examples/example-06/example.php-dist b/tests/examples/example-06/example.php-dist
new file mode 100644
index 0000000..2b03745
--- /dev/null
+++ b/tests/examples/example-06/example.php-dist
@@ -0,0 +1,4 @@
+<?php
+
+$myInteger = 1;
+echo $;
diff --git a/tests/examples/example-06/example.php.dist b/tests/examples/example-06/example.php.dist
new file mode 100644
index 0000000..2186cb4
--- /dev/null
+++ b/tests/examples/example-06/example.php.dist
@@ -0,0 +1,4 @@
+<?php
+
+$myInteger = 100;
+echo $myInteger;