Scan a directory for NON utf8 files using PHP

scan_dir_for_non_utf8.php

<?php
// Note this is NOT recursive.
function scan_dir_for_non_utf8($dir_path) {
  if ($dir = opendir($dir_path)) {
    echo "opening $dir_path";
    $files_scanned = 0;
    while (($file = readdir($dir)) !== false) {
      // Don't go up directory levels
      if (in_array($file, array('.','..')))
        continue;

      if (filetype($dir_path.$file) === 'file') {
        $content = file_get_contents($file);
        if (mb_detect_encoding($content, 'UTF-8', true) == 'UTF-8')
          $file_scanned++;
        else
          exit("$file NOT utf8\n\n");
      }
    }
    closedir($dir);
  }
  echo "\nscanned $file_scanned files. all utf8\n";
}

scan_dir_for_non_utf8( __DIR__ );