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关于PHP json_encode()函数

Jun 13, 2016 am 09:38 AM
json_encode php

在 php 中使用 json_encode() 内置函数(php > 5.2)可以使用得 php 中数据可以与其它语言很好的传递并且使用它。

这个函数的功能是将数值转换成json数据存储格式。

<?php
$arr = array
       (
          'Name'=>'希亚',
          'Age'=>20
       );
$jsonencode = json_encode($arr);
echo $jsonencode;
?>
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程序运行结果如下:

{"Name":null,"Age":20}
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json_encode 函数中中文被编码成 null 了,Google 了一下,很简单,为了与前端紧密结合,Json 只支持 utf-8 编码,我认为是前端的 Javascript 也是 utf-8 的原因。

<?php
$array = array
	(
	 	'title'=>iconv('gb2312','utf-8','这里是中文标题'),
		'body'=>'abcd...'
	);
echo json_encode($array);
?>
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这个程序的运行结果为:

{"title":"u8fd9u91ccu662fu4e2du6587u6807u9898","body":"abcd..."}
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数组中所有中文在json_encode之后都不见了或者出现u2353等。

解决方法是用urlencode()函数处理以下,在json_encode之前,把所有数组内所有内容都用urlencode()处理一下,然用json_encode()转换成json字符串,最后再用urldecode()将编码过的中文转回来。

<?php
/**************************************************************
 *
 *	使用特定function对数组中所有元素做处理
 *	@param	string	&$array		要处理的字符串
 *	@param	string	$function	要执行的函数
 *	@return boolean	$apply_to_keys_also		是否也应用到key上
 *	@access public
 *
 *************************************************************/
function arrayRecursive(&$array, $function, $apply_to_keys_also = false)
{
    static $recursive_counter = 0;
    if (++$recursive_counter > 1000) {
        die('possible deep recursion attack');
    }
    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]);
            }
        }
    }
    $recursive_counter--;
}
 
/**************************************************************
 *
 *	将数组转换为JSON字符串(兼容中文)
 *	@param	array	$array		要转换的数组
 *	@return string		转换得到的json字符串
 *	@access public
 *
 *************************************************************/
function JSON($array) {
	arrayRecursive($array, 'urlencode', true);
	$json = json_encode($array);
	return urldecode($json);
}
$array = array
       (
          'Name'=>'希亚',
          'Age'=>20
       );
echo JSON($array);
?>
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这次成功了,运行结果如下:

{"Name":"希亚","Age":"20"}
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