created base structure of the blockchain with directory structure

Author: tas-indranil

.gitignore

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+.idea
+test.txt

Blockchain/Backend/core/Block.php

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+<?php
+class Block {
+    /**
+     * Block is a storage container that stores transactions
+     */
+    public function __construct($Height, $blockSize, $blockHeader, $TxCount, $Txs) {
+        $this->Height = $Height;
+        $this->Blocksize = $blockSize;
+        $this->BlockHeader = $blockHeader;
+        $this->TxCount = $TxCount;
+        $this->Txs = $Txs;
+    }
+}
+

Blockchain/Backend/core/BlockHeader.php

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+<?php
+require_once 'Blockchain/Backend/util/util.php';
+
+class BlockHeader {
+    public function __construct($version, $prevBlockHash, $merkleRoot, $timestamp, $bits) {
+        $this->bits = $bits;
+        $this->timestamp = $timestamp;
+        $this->merkleRoot = $merkleRoot;
+        $this->prevBlockHash = $prevBlockHash;
+        $this->version = $version;
+        $this->nonce = 0;
+        $this->blockHash = '';
+    }
+
+
+    public function mine() {
+        while (substr($this->blockHash, 0, 4) !== '0000') {
+            $inputString = $this->version . $this->prevBlockHash . $this->merkleRoot . $this->timestamp . $this->bits . $this->nonce;
+            $inputString = hash256($inputString);
+            $this->blockHash = bin2hex($inputString);   // convert to hexadecimal
+            $this->nonce++;
+            echo "Mining started {$this->nonce}\r";
+        }
+        echo PHP_EOL; // Add a newline after mining is complete
+    }
+}

Blockchain/Backend/core/Blockchain.php

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+<?php
+require_once 'Blockchain/Backend/core/Block.php'; // Assuming the block.php file path
+require_once 'Blockchain/Backend/core/BlockHeader.php'; // Assuming the blockheader.php file path
+require_once 'Blockchain/Backend/util/util.php'; // Assuming the util.php file path
+
+$ZERO_HASH = str_repeat('0', 64);
+$VERSION = 1;
+
+class Blockchain {
+    private $chain = [];
+
+    public function __construct() {
+        $this->GenesisBlock();
+    }
+
+    private function GenesisBlock() {
+        $BlockHeight = 0;
+        $prevBlockHash = $GLOBALS['ZERO_HASH'];
+        $this->addBlock($BlockHeight, $prevBlockHash);
+    }
+
+    public function addBlock($BlockHeight, $prevBlockHash) {
+        $timestamp = time();
+        $Transaction = "Code Architect sent {$BlockHeight} Bitcoins to Indranil";
+        $merkleRoot = bin2hex(hash256($Transaction));
+        $bits = 'ffff001f';
+        $blockheader = new BlockHeader($GLOBALS['VERSION'], $prevBlockHash, $merkleRoot, $timestamp, $bits);
+        $blockheader->mine();
+        $block = new Block($BlockHeight, 1, (array)$blockheader, 1, $Transaction);
+        $this->chain[] = (array)$block;
+        print_r(json_encode($this->chain, JSON_PRETTY_PRINT));
+    }
+
+    public function main() {
+        while (true) {
+            $lastBlock = array_reverse($this->chain);
+            $BlockHeight = $lastBlock[0]['Height'] + 1;
+            $prevBlockHash = $lastBlock[0]['BlockHeader']['blockHash'];
+            $this->addBlock($BlockHeight, $prevBlockHash);
+        }
+    }
+}
+
+
+$blockchain = new Blockchain();
+$blockchain->main();
+

Blockchain/Backend/util/util.php

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+<?php
+function hash256($s) {
+    // Two rounds of SHA256
+    return hash('sha256', hash('sha256', $s, true), true);
+}