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json_encode() function for PHP 4 compatibility

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  1. if (!function_exists('json_encode'))
  2. {
  3.   function json_encode($a=false)
  4.   {
  5.     if (is_null($a)) return 'null';
  6.     if ($a === false) return 'false';
  7.     if ($a === true) return 'true';
  8.     if (is_scalar($a))
  9.     {
  10.       if (is_float($a))
  11.       {
  12.         // Always use "." for floats.
  13.         return floatval(str_replace(",", ".", strval($a)));
  14.       }
  15.  
  16.       if (is_string($a))
  17.       {
  18.         static $jsonReplaces = array(array("\\", "/", "\n", "\t", "\r", "\b", "\f", '"'), array('\\\\', '\\/', '\\n', '\\t', '\\r', '\\b', '\\f', '\"'));
  19.         return '"' . str_replace($jsonReplaces[0], $jsonReplaces[1], $a) . '"';
  20.       }
  21.       else
  22.         return $a;
  23.     }
  24.     $isList = true;
  25.     for ($i = 0, reset($a); $i < count($a); $i++, next($a))
  26.     {
  27.       if (key($a) !== $i)
  28.       {
  29.         $isList = false;
  30.         break;
  31.       }
  32.     }
  33.     $result = array();
  34.     if ($isList)
  35.     {
  36.       foreach ($a as $v) $result[] = json_encode($v);
  37.       return '[' . join(',', $result) . ']';
  38.     }
  39.     else
  40.     {
  41.       foreach ($a as $k => $v) $result[] = json_encode($k).':'.json_encode($v);
  42.       return '{' . join(',', $result) . '}';
  43.     }
  44.   }
  45. }

URL: http://usphp.com/manual/en/function.json-encode.php#82904

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