$files = array(
  array('filename' => 'Builder.php', 'required_perms' => '777')
);

$valid = true;

foreach ($files as $file) {
  //echo $filename;
  $required_perms = str_pad($file['required_perms'], 4, '0');
  $file_perms = substr(sprintf('%o', fileperms($file['filename'])), -4);
  $file['perms'] = substr(sprintf('%o', fileperms($file['filename'])), -4);
  if ($file['perms'] != $required_perms)
    $valid = false;
}