Php7 json_decode null

1. Confirm that the file has no BOM header

2. Tried the following ways to remove illegal strings, but still output 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 () output 4pm Syntax error, malformed JSON

4. Output the string directly, and the browser can parse josn normally, as shown in the screenshot

Php
Mar.21,2022

because your string is not a standard JSON string, the standard JSON string causes

by using "" for every string type.

Test Code 

<?php 
$jsonStr1 = '{status: {RetCode:0, msg: "success"}, data: {}}';
var_dump(json_decode($jsonStr1, true));
var_dump(json_last_error());

echo "----------------".PHP_EOL;

$jsonStr2 = '{"status": {"RetCode":0, "msg": "success"}, "data": {}}';
var_dump(json_decode($jsonStr2, true));

result 

NULL
int(4)
----------------
array(2) {
  ["status"]=>
  array(2) {
    ["RetCode"]=>
    int(0)
    ["msg"]=>
    string(7) "success"
  }
  ["data"]=>
  array(0) {
  }
}

= Update =

after debugging, it is found that it is caused by BOM . Here is the solution 

$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);
json_decode($jsonStr, true);

have you added the parameter true?

information is relatively small, it is difficult to judge, post $some_string to have a look, or explain where this value is obtained. 

$str="json" ;                       
dump($json_decode($str));               
echo $errorinfo=json_last_error();            
4  
htmlspecialchars_decode$str;

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