json_decode() returns null issues

Question

I\'ve an issue with my JSON. It works returns correctly in PHP 5.3 (so I can\'t use json_last_error()), and it returns successfully when I copy string explicitly into json_d

Answer 1

try to set the error reporting in ALL, the json_decode() should give you a notice in the offset where the conversion fails.

Answer 2

You can set the database charset before submitting - solved issues on my end:

$sql = $mysqli->set_charset("utf8");

Answer 3

You should use this

$jsonstring = stripslashes(str_replace('\"', '"', $jsonstring));

I tested this with PHP 5.3

Answer 4

Yesterday I spent 2 hours on checking and fixing that error finally I found that in JSON string that I wanted to decode were '\' slashes. So the logical thing to do is to use stripslashes function or something similiar to different PL.

Of course the best way is sill to print this var out and see what it becomes after json_decode, if it is null you can also use json_last_error() function to determine the error it will return integer but here are those int described:

0 = JSON_ERROR_NONE

1 = JSON_ERROR_DEPTH

2 = JSON_ERROR_STATE_MISMATCH

3 = JSON_ERROR_CTRL_CHAR

4 = JSON_ERROR_SYNTAX

5 = JSON_ERROR_UTF8

In my case I got output of json_last_error() as number 4 so it is JSON_ERROR_SYNTAX. Then I went and take a look into the string it self which I wanted to convert and it had in last line:

'\'title\' error ...'

After that is really just an easy fix.

$json = json_decode(stripslashes($response));
if (json_last_error() == 0) { // you've got an object in $json}