[php] Not equal to != and !== in PHP

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

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

Double = still works and has always worked for me, but whenever I search PHP operators I find no information on double =, so I assume I've always have done this wrong, but it works anyway. Should I change all my !== to != just for the sake of it?

!== 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

$a !== $b TRUE if $a is not equal to $b, or they are not of the same type

Please Refer to http://php.net/manual/en/language.operators.comparison.php

You can find the info here: http://www.php.net/manual/en/language.operators.comparison.php

It's scarce because it wasn't added until PHP4. What you have is fine though, if you know there may be a type difference then it's a much better comparison, since it's testing value and type in the comparison, not just value.