Checked the PHP site, and can't find a reference to them, but what are
==='s? They are all over the place, so I'm doubting it was just a typo
...
lib/Browser.php: return ($this->browser === $browser);
lib/Data.php: if (!empty($cell) || $cell === 0) {
lib/Horde.php: if ($dir === null) {
lib/MIME.php: if ($pos === false) {