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<?php function wer($x) { print_r($x); $x[] = 'ttt'; } $e = 'ert'; call_user_func('wer', [&$e]); print_r($x);
Output for 5.6.30, hhvm-3.15.4 - 3.21.3, 7.0.0 - 7.2.9
Array ( [0] => ert ) Notice: Undefined variable: x in /in/YB6Ea on line 8
Output for hhvm-3.22.0
Array ( [0] => ert ) Notice: Undefined variable: x in /in/YB6Ea on line -1