<?php
 
$nissan = Array(
    "model" => "Nissan X-Trail",
    "speed" => "150",
    "doors" => "5",
    "year" => "2017"
);
$toyota = Array(
    "model" => "X5",
    "speed" => "180",
    "doors" => "5",
    "year" => "2015"
);
$isuzu = Array(
    "model" => "Bighorn",
    "speed" => "120",
    "doors" => "5",
    "year" => "2005"
);
 
$cars = Array("nissan" => $nissan, "toyota" => $toyota, "isuzu" => $isuzu);
 
foreach ($cars as $mark => $key) {
    echo 'Фирма производитель - '.$mark;
 
    foreach ($key as $params => $value) {
        echo $params .' '. $value;
    }
}