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<?php // $mystring = null; if (empty($mystring)) { echo 'empty\n'; } if ($mystring == null) { echo 'null\n'; // and warning } if (!isset($mystring)) { echo 'unset\n'; }
Output for git.master, git.master_jit, rfc.property-hooks
empty\n Warning: Undefined variable $mystring in /in/U2bvg on line 8 null\nunset\n

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