Not equal to != and !== in PHP

Question

I\'ve always done this: if ($foo !== $bar)

But I realized that if ($foo != $bar) is correct too.

Double = still works

Answer 1

!== should match the value and data type

!= just match the value ignoring the data type

$num = '1';
$num2 = 1;

$num == $num2; // returns true    
$num === $num2; // returns false because $num is a string and $num2 is an integer