ajax中，使用Json代替xml加快速度

来源：互联网发布：ios电视直播软件2017 编辑：程序博客网时间：2024/04/29 16:09

<?php

    /*----------------------------------------------------------------------
        PHP JSON Class
        ==============
        The PHP JSON Class can be used to encode a php array or object into
        Java Script Object Notation, without the need for an additional PHP
        Extension.

        Normal usage is as follows:

            $json = new json;
            $encoded = $json->encode($var);
            echo $encoded;

        Version 0.5
        Copyright Jack Sleight - www.reallyshiny.com
        This script is licensed under the:
            Creative Commons Attribution-ShareAlike 2.5 License
    ----------------------------------------------------------------------*/

    class json {

        /*--------------------------------------------------
            Encode the variable/array/object
        --------------------------------------------------*/

        function encode($input) {

            $output = $this->get(NULL, $input);

            return $output;

        }

        /*--------------------------------------------------
            Get the encoded variable
        --------------------------------------------------*/

        function get($key, $value, $parent = NULL) {

            $type = $this->type($key, $value);

            switch ($type) {

                case 'object':
                    $value = '{'.$this->loop($value, $type).'}';
                    break;
                case 'array':
                    $value = '['.$this->loop($value, $type).']';
                    break;
                case 'number':
                    $value = $value;
                    break;
                case 'string':
                    $value = '"'.$this->escape($value).'"';
                    break;
                case 'boolean':
                    $value = ($value) ? 'true' : 'false';
                    break;
                case 'null':
                    $value = 'null';
                    break;

            }

            if(!is_null($key) && $parent != 'array')
                $value = '"'.$key.'":'.$value;

            return $value;

        }

        /*--------------------------------------------------
            Check the type of the variable
        --------------------------------------------------*/

        function type($key, $value) {

            if(is_object($value)) {
                $type = 'object';
            }
            elseif(is_array($value)) {
                if($this->is_assoc($value))
                    $type = 'object';
                else
                    $type = 'array';
            }
            elseif(is_int($value) || is_float($value)) {
                $type = 'number';
            }
            elseif(is_string($value)) {
                $type = 'string';
            }
            elseif(is_bool($value)) {
                $type = 'boolean';
            }
            elseif(is_null($value)) {
                $type = 'null';
            }
            else {
                die($key.' is of an unsupported type.');
            }

            return $type;

        }

        /*--------------------------------------------------
            Loop through the array/object
        --------------------------------------------------*/

        function loop($input, $type) {

            $output = NULL;

            foreach($input as $key => $value) {
                $output .= $this->get($key, $value, $type).',';
            }

            $output = trim($output, ',');

            return $output;

        }

        /*--------------------------------------------------
            Escape strings
        --------------------------------------------------*/

        function escape($string) {

            $find = array('//',        '"',    '/',    "/b",    "/f",    "/n",    "/r",    "/t",    "/u");
            $repl = array('////',    '/"',    '//',    '/b',    '/f',    '/n',    '/r',    '/t',    '/u');

            $string = str_replace($find, $repl, $string);

            return $string;

        }

        /*--------------------------------------------------
            Check if the array is associative
        --------------------------------------------------*/

        function is_assoc($array) {

            krsort($array, SORT_STRING);
            return !is_numeric(key($array));

        }

    }

?>

从这个站找来的，还有些相关资料，大家可以再看看
http://www.reallyshiny.com/scripts/php-json-class/

这个地址是pecl的json编译好了的dll下载，可以根据自己使用php版本来下有
http://pecl4win.php.net/ext.php/php_json.dll

具体使用办法:

$arr=array(
"name"=>"killall","sex"=>"boy");

$str=json_encode($arr);//将数组转为json格式
echo $str;
echo "<br>";
$a=json_decode($str,false);//true返回为数组，flase返回对对象，默认为flase
echo $a->name;
?>

在客户端 str=eval("(+json+")");