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<?php function foo(&$obj) { return $obj; } $o = "abc"; // No errors foo($o); call_user_func('foo', $o); call_user_func('foo', [$o]); $a[] = "abc"; $a[] = "abc"; $a[] = "abc"; // Warning: Parameter 1 to foo() expected to be a reference, value given in call_user_func('foo', array_slice($a, 0, 1));
Output for git.master, git.master_jit, rfc.property-hooks
Warning: foo(): Argument #1 ($obj) must be passed by reference, value given in /in/WMMQa on line 10 Warning: foo(): Argument #1 ($obj) must be passed by reference, value given in /in/WMMQa on line 11 Warning: foo(): Argument #1 ($obj) must be passed by reference, value given in /in/WMMQa on line 18

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