In what scenarios is it better to use json_encode () than to use serialize ()?

Question

This is about all I need to ask. I looked through the PHP manual and saw a user message stating that serialization is 45-90% slower than json_encode (he did some tests). But how slowly, slowly? I can find many cons things sprawling around, but not one of them that can be a beginner like me.

I just wrote a script that encoded the array in json and the other to decode it. I did the same with serialization. Obviously, this will not tell me any significant differences between the two.

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class A {
    public $a;
    public function __construct($a) {
        $this->a = $a;
    }
}

$test = new A(10);

Now let's serialize and unserialize $ test:

var_dump(unserialize(serialize($test)));

We get:

object(A)[2]
  public 'a' => int 10

those. object, an instance of class A.

Now do the same with JSON:

var_dump(json_decode(json_encode($test)));

Now we only have an instance of stdClass:

object(stdClass)[2]
  public 'a' => int 10

JSON is nice to share data (information about "class A" is important for PHP, but probably does not make much sense for another application); but also has its limitations.