json_encode替代函数

<?php

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 (empty ($var) || array_keys($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‘;

        }

    }

}

$arr=array(‘name‘=>‘CSDN论坛‘,‘degree‘=>‘numberone‘);

echo jsonEncode($arr);

?>