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<?php $bar = new stdClass(); function testfunc(&$foo = null) { print_r($foo); } call_user_func_array('testfunc', array($bar));
Output for git.master, git.master_jit, rfc.property-hooks
Warning: testfunc(): Argument #1 ($foo) must be passed by reference, value given in /in/RIHGD on line 5 stdClass Object ( )

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