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<?php function foo(&$arg) { echo "hi\n"; var_dump($arg); } $a = 'bar'; $b =& $a; call_user_func_array('foo', [$b]); call_user_func_array('foo', [&$a]);
Output for git.master, git.master_jit, rfc.property-hooks
Warning: foo(): Argument #1 ($arg) must be passed by reference, value given in /in/ZDO3o on line 11 hi string(3) "bar" hi string(3) "bar"

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