php - Boolean OR in condition - what's wrong? -


here's condition - 

if ($file !== "." || $file !== "..")

not working.

if (($file !== ".") || ($file !== ".."))

not working either.

if ($file !== ".")

works fine. ' drives me edgy. i've read php.net has offer on logical operators (http://php.net/manual/en/language.operators.logical.php), bunch of crappy tutorials googled up, , triple-checked operator precedence. points, either of ways should work.

what reason?

$file should not . , should not ..

if ($file !== "." && $file !== "..")


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