Because === and !== check the type as well. Of you set $string = 'blah' you'll still get the same result.
If you were using != and == both would print.
strpos() returns an int, so comparing it to false with === is always false. The same would be true for true.
That's half right. strpos actually *can* return false as opposed to 0, so checking doing the === check might be necessary for your application.
<?php
$string = 'blah';
if (strpos($string, 'not in the original $string') === false){
echo 'False check succeeded - not in $string.';
}if (strpos($string, $string) === true) {
echo 'True check succeeded - in string';
} else {
echo 'True check failed - because strpos was at offset 0.';
}?>
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