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<?php $formval = "0"; if (isset($formval)) { echo "is set\n"; } $defined = null; var_dump(is_null($defined)); var_dump(is_null($undefined));
Output for git.master, git.master_jit, rfc.property-hooks
is set bool(true) Warning: Undefined variable $undefined in /in/8N1Be on line 9 bool(true)

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