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<?php $b = null; var_dump(isset($a)); var_dump(isset($b)); var_dump($a==null); var_dump($b==null); var_dump($a===null); var_dump($b===null);
Output for git.master, git.master_jit, rfc.property-hooks
bool(false) bool(false) Warning: Undefined variable $a in /in/EN7YD on line 8 bool(true) bool(true) Warning: Undefined variable $a in /in/EN7YD on line 11 bool(true) bool(true)

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