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--TEST--
call_user_func() behavior when passing literal to reference parameter
--FILE--
<?php
namespace Foo;
var_dump(call_user_func('sort', []));
var_dump(\call_user_func('sort', []));
?>
--EXPECTF--
Warning: sort(): Argument #1 ($array) must be passed by reference, value given in %s on line %d
bool(true)
Warning: sort(): Argument #1 ($array) must be passed by reference, value given in %s on line %d
bool(true)
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