search in text by php

search_text_in_files.php

<?php
function files_list($dir, &$files, $types_ar, $required_text) {
  $fp = opendir($dir);
  while ($file = readdir($fp)) {
    $path = $dir . '/' . $file;
    if (is_file($path)) {
      if (in_array(end(explode('.', $file)), $types_ar)) {
        $files[]  = $path;
        $contents = file_get_contents($path);
        $pos      = strpos($contents, $required_text);
        if ($pos !== false) {
          echo $path . '<br />';
        }
      }
    } elseif ($file !== '.' && $file !== '..' && is_dir($path)) {
      files_list($path, $files, $types_ar, $required_text);
    }
  }
  closedir($fp);
}
$files = array();
files_list($_SERVER['DOCUMENT_ROOT'], $files, array('php'), 'my_text');