Parse HTTP header Accept-Language

accept_lang.php

<?php

function get_http_accept_language($accept_language = null) {

  if (($accept_language == "") && isset($_SERVER['HTTP_ACCEPT_LANGUAGE']))
    $accept_language = $_SERVER['HTTP_ACCEPT_LANGUAGE'];

  $langs = array();

  if (preg_match_all('/([a-z]{1,8}(?:-[a-z]{1,8})?)\s*(?:;\s*q\s*=\s*(1|0\.[0-9]+))?/i',
                     $accept_language, $regp)) {
    for ($i = 0; $i < count($regp[0]); $i++) {
      $langs[$regp[1][$i]] = (float) ($regp[2][$i] ?: 1);
    }
    arsort($langs);
  }

  return $langs;
}


var_dump(get_http_accept_language());