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Have you ever run into trouble when using strcmp() function and the match found at position 0 ? strcmp() returns either an index of the first match or FALSE, if the match is not found. It is easy to see that FALSE and 0 can sometimes be interpreted by PHP as the same thing (when clearly they are not).

To avoid this hiccup from happening use “===” operator which means “equals and is of the same type”.

$str = "Look inside me";
$findMe = "Loo";
if (strcmp($str, $findMe) === 0) { ... match found at position 0 ... }