PHP helper function to escape javascript strings like a true paranoid mofo

Paranoia-escape-js.php

<?php

/**
 * Extremely paranoid escaping function for use with inline JS strings.
 *
 * Escapes every single character to a \x# format.
 *
 * @param string
 *
 * @return string
 */
function paranoid_js_escape($str) {
  $output = '';
  $length = strlen($str);
  for($i = 0; $i < $length; $i++) {
    $output .= '\\x' . sprintf('%02x', ord(substr($str, $i, 1)));
  }
  return $output;
}

poops all ovre UTF-8 :(