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<?php function wer($x) { echo $x; } $e = 'ert'; call_user_func('wer', &$e);
Output for 7.0.0 - 7.0.20, 7.1.0 - 7.1.7
Parse error: syntax error, unexpected '&' in /in/GWWuh on line 6
Process exited with code 255.

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