feat: add PHP implementation

PHP/XOREncryption.php

@@ -0,0 +1,18 @@
+<?php
+
+function encryptDecrypt($input) {
+    $key = ['K', 'C', 'Q']; //Can be any chars, and any size array
+    $output = '';
+
+    for ($i = 0; $i < strlen($input); $i++) {
+        $output .= $input[$i] ^ $key[$i % count($key)];
+    }
+    return $output;
+}
+
+$encrypted = encryptDecrypt('kylewbanks.com');
+echo "Encrypted:" . $encrypted . "\n";
+
+$decrypted = encryptDecrypt($encrypted);
+echo "Decrypted:" . $decrypted . "\n";
+