Multidimensional arrays in PHP

arraysTest.php

<?php

class Tool {
	/**
	 * @return Tool[][]
	 */
	function getItems() {
		return call_user_func('x'); // dummy
	}
}


$t = new Tool;
$a = $t->getItems();
$b = $a[0];
$c = $b[0];

// should be: Tool[][] $a     Tool[] $b   Tool $c
// PhpStorm   Tool[]   $a     Tool   $b   ?     $c
// NetBeans   all are equal, act as both Tool[] and Tool