<?php
  class helper_jquery{

    public function json($data){
      return $this->php2js($data);
    }
    public function charset_decode($data){
      foreach($data as $key=>&$value){
        $value = stripslashes(iconv('utf-8','windows-1251',$value));
      }
      return $data;
    }
    private function php2js($a=false)
    {
      if (is_null($a)) return 'null';
      if ($a === false) return 'false';
      if ($a === true) return 'true';
      if (is_scalar($a))
      {
        if (is_float($a))
        {
          // Always use "." for floats.
          $a = str_replace(",", ".", strval($a));
        }

        // All scalars are converted to strings to avoid indeterminism.
        // PHP's "1" and 1 are equal for all PHP operators, but
        // JS's "1" and 1 are not. So if we pass "1" or 1 from the PHP backend,
        // we should get the same result in the JS frontend (string).
        // Character replacements for JSON.
        static $jsonReplaces = array(array("\\", "/", "\n", "\t", "\r", "\b", "\f", '"'),
        array('\\\\', '\\/', '\\n', '\\t', '\\r', '\\b', '\\f', '\"'));
        return '"' . str_replace($jsonReplaces[0], $jsonReplaces[1], $a) . '"';
      }
      $isList = true;
      for ($i = 0, reset($a); $i < count($a); $i++, next($a))
      {
        if (key($a) !== $i)
        {
          $isList = false;
          break;
        }
      }
      $result = array();
      if ($isList)
      {
        foreach ($a as $v) $result[] = $this->php2js($v);
        return '[ ' . join(', ', $result) . ' ]';
      }
      else
      {
        foreach ($a as $k => $v) $result[] = $this->php2js($k).': '.$this->php2js($v);
        return '{ ' . join(', ', $result) . ' }';
      }
    }    
  }
?>