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<?php function logMe($string) { global $foo; if (isset($foo)) { return $foo . $string; } } var_dump(logMe('string')); $foo = 'bar'; var_dump(logMe('string'));
Output for 4.3.0 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
NULL string(9) "barstring"