Online PHP editor | refs for q68fI

<?php function f0() {} function f1() {} function f2() {} function f3() {} assert(get_defined_functions()['user'] === array('f0', 'f1', 'f2', 'f3')); assert(get_defined_functions('user') === array('f0', 'f1', 'f2', 'f3')); assert(get_defined_functions(0) === array('f0', 'f1', 'f2', 'f3')); assert(get_defined_functions(1) === array('f1', 'f2', 'f3')); assert(get_defined_functions(3) === array('f3')); assert(get_defined_functions(4) === array()); assert(get_defined_functions(5) === array());