Online PHP editor | refs for TZaVe

<?php function foo(&$obj) { return $obj; } $o = array(); // No errors foo($o); call_user_func('foo', $o); call_user_func('foo', [$o]); $a[] = array(); $a[] = array(); $a[] = array(); // Warning: Parameter 1 to foo() expected to be a reference, value given in call_user_func('foo', array_slice($a, 0, 1));