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<?php var_dump(empty( $var )); var_dump( isset( $var ) && $var == NULL ); var_dump(is_null($var)); var_dump($var === NULL);
Output for git.master, git.master_jit, rfc.property-hooks
bool(true) bool(false) Warning: Undefined variable $var in /in/s7hi2 on line 5 bool(true) Warning: Undefined variable $var in /in/s7hi2 on line 6 bool(true)

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