具体问题描述:
1、确认文件无BOM头
2、尝试了如下多种方式去除非法字符串,但是仍然输出NULL
$some_string = htmlspecialchars_decode($some_string);
$some_string = preg_replace("/\t/", " ", $some_string);
$some_string = preg_replace("/\n/", ' ', $some_string);
$some_string = str_replace("\n", ' ', $some_string);
$some_string = str_replace ('\n','', $some_string);
3、json_last_error()输出4,Syntax error, malformed JSON
4、直接输出字符串,浏览器能够正常解析josn,如下截图
解决办法:
因为你的字符串不是标准的JSON字符串, 标准的JSON字符串每个string类型都要用"引起了
测试代码
<?php
$jsonStr1 = '{status: {RetCode:0, msg: "success"}, data: {}}';
var_dump(json_decode($jsonStr1, true));
var_dump(json_last_error());
echo "--------分割线--------".PHP_EOL;
$jsonStr2 = '{"status": {"RetCode":0, "msg": "success"}, "data": {}}';
var_dump(json_decode($jsonStr2, true));
结果
NULL
int(4)
--------分割线--------
array(2) {
["status"]=>
array(2) {
["RetCode"]=>
int(0)
["msg"]=>
string(7) "success"
}
["data"]=>
array(0) {
}
}
============== 更新 ==============
经过调试,发现是 BOM 引起的,下面是解决方案
$dataString = $merchant_arr['data'];
$A = substr($dataString, 0, 1);
$B = substr($dataString, 1, 1);
$C = substr($dataString, 2, 1);
if ((ord($A) == 239) && (ord($B) == 187) && (ord($C) == 191)) {
$dataString = substr($dataString, 3);
}
$dataArray = json_decode($dataString, true);