Description:
------------
---
From manual page: https://php.net/function.json-encode
---

Just look at the sample code

Test script:
---------------
<?php
$a = "Srting with a slash: \ Just a slash is that I want!";
$b = "Srting with a slash: \\ Just a slash is that I want!";

var_dump($a);
var_dump(json_encode($a));

var_dump($b);
var_dump(json_encode($b));


Expected result:
----------------
string(51) "Srting with a slash: \ Just a slash is that I want!"
string(53) ""Srting with a slash: \ Just a slash is that I want!""
string(51) "Srting with a slash: \ Just a slash is that I want!"
string(53) ""Srting with a slash: \ Just a slash is that I want!""


Actual result:
--------------
string(51) "Srting with a slash: \ Just a slash is that I want!"
string(54) ""Srting with a slash: \\ Just a slash is that I want!""
string(51) "Srting with a slash: \ Just a slash is that I want!"
string(54) ""Srting with a slash: \\ Just a slash is that I want!""