- print_r: documentation ( source)
<?php
/**
* Assigning values to a multidimensional array, new key has to be put
* in the first position of the array expression, for example,
*/
$foo = array();
$foo['foo'] = 'hello';
// Wrong key order
// $foo['foo']['bar'] = 'world';
// Right key order
$foo['bar']['foo'] = 'world';
print_r($foo);
?>