- var_dump: documentation ( source)
<?php
$a1 = array('car1' => array('color' => 'black',
'weight'=> '100'),
'car2' => array('color' => 'white',
'weight'=> '200'));
foreach($a1 as &$car){
$car['type'] = 'легковая';
}
var_dump($a1);
foreach($a1 as $key => $car){
var_dump( $key, $car);
}