Curly braces for array acces?

curly_array.php

<?php
$x   = 10;
$foo = null;
$ref = &$foo;

do {
	$ref = array('foo' => 'bar');
	$ref = &$ref['foo'];
} while (--$x);

echo $foo{'foo'}['foo']{'foo'}['foo']{'foo'}['foo']{'foo'}['foo']{'foo'}['foo'];