feat: add php solution to lc problem: No.0125 (#951)

Author: Qiu-IT

solution/0100-0199/0125.Valid Palindrome/README.md

@@ -308,6 +308,30 @@ func verify(ch byte) bool {
 }
 ```
 
+### **PHP**
+
+```php 
+class Solution {
+    /**
+     * @param String $s
+     * @return Boolean
+     */
+    function isPalindrome($s) {
+        $regex = "/[a-z0-9]/";
+        $s = strtolower($s);
+        preg_match_all($regex, $s, $matches);
+        if ($matches[0] == Null) return true;
+        $len = floor(count($matches[0]) / 2);
+        for ($i = 0; $i < $len; $i++) {
+            if ($matches[0][$i] != $matches[0][count($matches[0]) - 1 - $i]) {
+                return false;
+            }
+        }
+        return true;
+    }
+}
+```
+
 ### **...**
 
 ```

solution/0100-0199/0125.Valid Palindrome/README_EN.md

@@ -296,6 +296,30 @@ func verify(ch byte) bool {
 }
 ```
 
+### **PHP**
+
+```php 
+class Solution {
+    /**
+     * @param String $s
+     * @return Boolean
+     */
+    function isPalindrome($s) {
+        $regex = "/[a-z0-9]/";
+        $s = strtolower($s);
+        preg_match_all($regex, $s, $matches);
+        if ($matches[0] == Null) return true;
+        $len = floor(count($matches[0]) / 2);
+        for ($i = 0; $i < $len; $i++) {
+            if ($matches[0][$i] != $matches[0][count($matches[0]) - 1 - $i]) {
+                return false;
+            }
+        }
+        return true;
+    }
+}
+```
+
 ### **...**
 
 ```

solution/0100-0199/0125.Valid Palindrome/Solution.php

@@ -0,0 +1,19 @@
+class Solution {
+    /**
+     * @param String $s
+     * @return Boolean
+     */
+    function isPalindrome($s) {
+        $regex = "/[a-z0-9]/";
+        $s = strtolower($s);
+        preg_match_all($regex, $s, $matches);
+        if ($matches[0] == Null) return true;
+        $len = floor(count($matches[0]) / 2);
+        for ($i = 0; $i < $len; $i++) {
+            if ($matches[0][$i] != $matches[0][count($matches[0]) - 1 - $i]) {
+                return false;
+            }
+        }
+        return true;
+    }
+}