A script to find all PHP files with leading or trailing whitespace

scan.php

<?php

  header('Content-Type: text/plain');

  $dir_iterator = new RecursiveDirectoryIterator("./");
  $iterator = new RecursiveIteratorIterator($dir_iterator, RecursiveIteratorIterator::SELF_FIRST);

  $count=0;
  foreach ($iterator as $file) {
    $count++;

    if (!preg_match('#\.php$#', $file)) continue;
    $contents = file_get_contents($file);
    
    if (preg_match('#^\s+<\?php#', $contents)) {
      echo $file .' (Whitespace before opening <?php at BOF)'. PHP_EOL;
    }
    if (preg_match('#\?>\s+$#', $contents)) {
      echo $file .' (Whitespace after closing ?> at EOF)'. PHP_EOL;
    }
  }

  echo "$count files scanned" . PHP_EOL;