gistfile1.php

<?php
$dranken = array('cola', 'fanta', 'bier', 'koffie', 'thee');
$prijzen = array(2, 2, 1.80, 2.20, 2.20);

$max = min(count($dranken), count($prijzen));

for ($i = 0; $i < $max; $i++) {
    echo $dranken[$i] . ': ' . $prijzen[$i] . '<br />';
}

/////////////////////////////////////////////////////////////

$producten = array(
    array(
        'drank' => 'cola',
        'prijs' => 2,
    ),
    array(
        'drank' => 'fanta',
        'prijs' => 2,
    ),
    array(
        'drank' => 'bier',
        'prijs' => 1.8,
    ),
    array(
        'drank' => 'koffie',
        'prijs' => 2.2,
    ),
    array(
        'drank' => 'thee',
        'prijs' => 2.2,
    ),
);

foreach ($producten as $product) {
    echo $product['drank'] . ': ' . $product['prijs'] . '<br />';
}

/////////////////////////////////////////////////////////////////

$producten = array(
    'cola'   => 2,
    'fanta'  => 2,
    'bier'   => 1.8,
    'koffie' => 2.2,
    'thee'   => 2.2,
);

foreach ($producten as $product => $prijs) {
    echo $product . ': ' . $prijs . '<br />';
}