phpjs/experimental/language/$_GET.js

php.js offers community built php functions in javascript

function $_GET(name) {
  // http://kevin.vanzonneveld.net
  // +   original by: Brett Zamir (http://brett-zamir.me)
  // %     note 1: See import_request_variables() for building a $_GET object which allows the PHP-like bracket access.
  // *     example 1: document.cookie = 'test=hello';
  // *     example 1: var $myVar = $_COOKIE('test'); // Note the round brackets!
  // *     returns 1: 'hello'

  var nameEQ = name + '=',
      url = window.location.href,
      pos = url.indexOf('?'),
      url = url.slice(pos + 1),
      arr = url.split('&'),
      i = 0,
      pair = '',
      arrl = arr.length;
  for (i = 0; i < arrl; i++) {
    var pair = arr[i];
    if (pair.indexOf(nameEQ) === 0) {
      return decodeURIComponent(pair.slice(nameEQ.length).replace(/\+/g, '%20'));
    }
  }
  return null;
}