Does PHP negation check with `!` coprrespond to `!=` or to `!==`?

Question

In PHP, is

if(!$foo)

equivalent with

if($foo != true)

or with

if($foo !== true)

Answer 1

Its not the same

!= is No equal (Returns true if  is not equal)
!== is Not identical  (Returns true if  is not equal , or they are not of the same type)