text: function array_search(needle, haystack, argStrict) {
    //  discuss at: http://phpjs.org/functions/array_search/
    // original by: Kevin van Zonneveld (http://kevin.vanzonneveld.net)
    //    input by: Brett Zamir (http://brett-zamir.me)
    // bugfixed by: Kevin van Zonneveld (http://kevin.vanzonneveld.net)
    //  depends on: array
    //        test: skip
    //   example 1: array_search('zonneveld', {firstname: 'kevin', middle: 'van', surname: 'zonneveld'});
    //   returns 1: 'surname'
    //   example 2: ini_set('phpjs.return_phpjs_arrays', 'on');
    //   example 2: var ordered_arr = array({3:'value'}, {2:'value'}, {'a':'value'}, {'b':'value'});
    //   example 2: var key = array_search(/val/g, ordered_arr); // or var key = ordered_arr.search(/val/g);
    //   returns 2: '3'
  
    var strict = !! argStrict,
      key = '';
  
    if (haystack && typeof haystack === 'object' && haystack.change_key_case) {
      // Duck-type check for our own array()-created PHPJS_Array
      return haystack.search(needle, argStrict);
    }
    if (typeof needle === 'object' && needle.exec) {
      // Duck-type for RegExp
      if (!strict) {
        // Let's consider case sensitive searches as strict
        var flags = 'i' + (needle.global ? 'g' : '') +
          (needle.multiline ? 'm' : '') +
        // sticky is FF only
        (needle.sticky ? 'y' : '');
        needle = new RegExp(needle.source, flags);
      }
      for (key in haystack) {
        if(haystack.hasOwnProperty(key)){
            if (needle.test(haystack[key])) {
                return key;
            }
        }
      }
      return false;
    }
  
    for (key in haystack) {
      if(haystack.hasOwnProperty(key)){
          if ((strict && haystack[key] === needle) || (!strict && haystack[key] == needle)) {
              return key;
          }
      }
    }
  
    return false;
  }
  