<?php
error_reporting(E_ALL);

var_dump(array(1, 2, 3, 4,) [3]);
var_dump(array(1, 2, 3, 4,) ['foo']);
var_dump(array(array(1,2,3), array(4, 5, 6))[1][2]);

foreach (array(array(1, 2, 3))[0] as $var) {
     echo $var;
}
?>