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<?php namespace foo; $foo = function (&$arg) { var_dump($arg); }; $a = 'bar'; $b =& $a; call_user_func_array($foo, [$b]); \call_user_func_array($foo, [$b]);
Output for git.master, git.master_jit, rfc.property-hooks
Warning: foo\{closure}(): Argument #1 ($arg) must be passed by reference, value given in /in/Saf3Y on line 12 string(3) "bar" Warning: foo\{closure}(): Argument #1 ($arg) must be passed by reference, value given in /in/Saf3Y on line 13 string(3) "bar"

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