Question

Consider j.json file that its content is following valid json:

{
    "t": "\\"
}

PHP json_encode can not pars it:

$r=json_decode(file_get_contents('j.json'));

var_dump($r); //returns null

note: The question is cleaned up, the problem is same.

Answer 1

Unfortunately json_decode is implemented incorrectly and may return null when get some valid json file or may modify their values, you can use following function that can decode all valid json strings:

function r_json_decode($jsonString,$originalJsonValue=false){

    $j=($originalJsonValue)?str_replace('\\','\\\\\\\\',$jsonString):str_replace('\\','\\\\',$jsonString);
    return json_decode($j);

}


echo(r_json_decode(file_get_contents('j.json'))->t);     // prints "/"
echo(r_json_decode(file_get_contents('j.json'),true)->t); //prints "//"