Why is === faster than == in PHP?

Question

Why is === faster than == in PHP?

Answer 1

In php (c code) value is a "class" like:

class value
{
    $int_;
    $float_;
    $string_;
    $array_;
    $object_;
}

When your are comparing $a == $b and $a is int type, there will be something like:

if ($a->int_ == $b->int_ || $a->int_ == (int) $b->float_ || $a->int_ == (int) $b->string_ || ...)

but string '1' will not be cast to ascii code 49, it will be 1.

When you are comparing $a === $b and $a is int type, there will be someting like:

if ($a->int_ == $b->int_)