php json_encode函数的替代方法(可显示中文)

/**
 * json_encode的替代函数
 * Edit bbs.it-home.org
*/
    function jsonEncode($var) {
        if (function_exists('json_encode')) {
            return json_encode($var);
        } else {
            switch (gettype($var)) {
                case 'boolean':
                    return $var ? 'true' : 'false'; // Lowercase necessary!
                case 'integer':
                case 'double':
                    return $var;
                case 'resource':
                case 'string':
                    return '"'. str_replace(array("\r", "\n", "", "&"),
                        array('\r', '\n', '\x3c', '\x3e', '\x26'),
                        addslashes($var)) .'"';
                case 'array':
                    // Arrays in JSON can't be associative. If the array is empty or if it
                    // has sequential whole number keys starting with 0, it's not associative
                    // so we can go ahead and convert it as an array.
                    if (emptyempty ($var) || array_keys($var) === range(0, sizeof($var) - 1)) {
                        $output = array();
                        foreach ($var as $v) {
                            $output[] = jsonEncode($v);
                        }
                        return '[ '. implode(', ', $output) .' ]';
                    }
                    // Otherwise, fall through to convert the array as an object.
                case 'object':
                    $output = array();
                    foreach ($var as $k => $v) {
                        $output[] = jsonEncode(strval($k)) .': '. jsonEncode($v);
                    }
                    return '{ '. implode(', ', $output) .' }';
                default:
                    return 'null';
            }
        }
    }

    echo jsonEncode(array('first'=>'testing','second'=>'tangjili'));
?>

也可以是下面这样的代码。

    function php_json_encode( $data ) {
        if( is_array($data) || is_object($data) ) {
            $islist = is_array($data) && ( emptyempty($data) || array_keys($data) === range(0,count($data)-1) );
            if( $islist ) $json = '[' . implode(',', array_map('php_json_encode', $data) ) . ']';
            else {
                $items = Array();
                foreach( $data as $key => $value ) $items[] = php_json_encode("$key") . ':' . php_json_encode($value);
                $json = '{' . implode(',', $items) . '}';
            }
        } elseif( is_string($data) ) {
            $string = '"' . addcslashes($data, "\\\"\n\r\t/" . chr(8) . chr(12)) . '"';

            $json    = '';
            $len    = strlen($string);
            for( $i = 0; $i                 $char = $string[$i];

                $c1 = ord($char);
                if( $c1  31) ? $char : sprintf("\\u%04x", $c1); continue; }
                $c2 = ord($string[++$i]);
                if ( ($c1 & 32) === 0 ) { $json .= sprintf("\\u%04x", ($c1 - 192) * 64 + $c2 - 128); continue; }
                $c3 = ord($string[++$i]);
                if( ($c1 & 16) === 0 ) { $json .= sprintf("\\u%04x", (($c1 - 224)                 $c4 = ord($string[++$i]);
                if( ($c1 & 8 ) === 0 ) {
                    $u = (($c1 & 15) >4) & 3) - 1;
                    $w1 = (54>4) & 3);
                    $w2 = (55                    $json .= sprintf("\\u%04x\\u%04x", $w1, $w2);
                }
            }
        }
        else $json = strtolower(var_export( $data, true ));

        return $json;
    }
    echo php_json_encode(array('first'=>'testing'));
?>

中文的话，可以结合如下的函数来使用。

    function arrayRecursive(&$array, $function, $apply_to_keys_also = false)
    {
        foreach ($array as $key => $value) {
            if (is_array($value)) arrayRecursive($array[$key], $function, $apply_to_keys_also);
            else $array[$key] = $function($value);

            if ($apply_to_keys_also && is_string($key)) { $new_key = $function($key); if ($new_key != $key) { $array[$new_key] = $array[$key]; unset($array[$key]); } }
        }
    }
?>

调用示例：

    function JSON($array) {
        arrayRecursive($array, 'urlencode', true);
        $json = jsonEncode($array); // 或者 $json = php_json_encode($array);
        return urldecode($json);
    }

    echo JSON(array('first'=>'testing','second'=>'中文'));
?>