<?php
$coches = [
	'Toyota' => [
		'Modelo' => 'Corolla',
		'Precio' => '15.400',
		'Color' => 'Azul'
	]
];

foreach ($coches as $marca => $detalles){
    echo strtoupper($marca) . "\n";
    
    foreach ($detalles as $clave => $valor){
        echo $clave . ': ' . $valor . "\n";
    }
}