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What is the difference between realpath($path) and is_dir($path)?
I know realpath follows symbolic links, but is there a performance difference between the two?
Realpath returns the canonicalized actual pathname of a file on success, is_dir returns a boolean value of whether or not the file is a directory.
http://php.net/manual/en/function.is-dir.php
http://php.net/manual/en/function.realpath.php