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php如何判断是否为json数据格式

May 26, 2016 am 08:21 AM
json format

下面我来给各位朋友总结了几篇关于php如何判断是否为json数据的文章,这里整理了一下也能让你知道如何利用php判断json了,希望例子对你带来帮助.

首先要记住json_encode返回的是字符串,而json_decode返回的是对象.

判断数据不是JSON格式,代码如下:

function is_not_json($str){  
    return is_null(json_decode($str)); 
}
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判断数据是合法的json数据,PHP版本大于5.3,代码如下:

function is_json($string) { 
    json_decode($string); 
    return (json_last_error() == JSON_ERROR_NONE); 
}
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json_last_error()函数返回数据编解码过程中发生的错误.

注意:json编解码所操作字符串必须是UTF8的.

例子,代码如下:

<?php
/** 
* 解析json串 
* @param type $json_str 
* @return type 
*/ 
function analyJson($json_str) { 
    $json_str = str_replace(&#39;\\&#39;, &#39;&#39;, $json_str); 
    $out_arr = array(); 
    preg_match(&#39;/{.*}/&#39;, $json_str, $out_arr); 
    if (!emptyempty($out_arr)) { 
        $result = json_decode($out_arr[0], TRUE); 
    } else {//开源代码phprm.com 
        return FALSE; 
    } 
    return $result; 
}
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如果不是json则返回false.


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