Description:
------------
is_callable function behavior changed in php 7.4


Test script:
---------------
<?php
class A
{
    public function serialize($v)
    {

    }

    public function func($v)
    {

    }
    
}

var_dump(is_callable(['A', 'serialize']));

var_dump(is_callable(['A', 'func']));

Expected result:
----------------
bool(true)
bool(true)

as in php before 7.4


Actual result:
--------------
in php 7.4 we have
bool(false)
bool(true)