yes it is very useful operator when you want to match the data types as well as values e.g

<?php

$value1 = 3;

$value2 = "3";

if($value1 === $value2)

echo "matched";

else

echo "not matched";

?>

You will get the NOT MATCHED output because value1 has 3 as integer value on the other hand 3 is string in value2 variable. So whenever you need to match data type as well as value you should use === operator.