What is the correct way to replace the hard coded values?

<?php
//edit this array
$contacts[] = array('name' => 'Alena Holligan',
                   'email' => 'alena.holligan@teamtreehouse.com');
$contacts[] = array('name' => 'Dave McFarland',
                   'email' => 'dave.mcfarland@teamtreehouse.com');
$contacts[] = array('name' => 'Treasure Porth',
                   'email' => 'treasure.porth@teamtreehouse.com');
$contacts[] = array('name' => 'Andrew Chalkley',
                   'email' => 'andrew.chalkley@teamtreehouse.com');

echo "<ul>\n";
//$contacts[0] will return 'Alena Holligan' in our simple array of names.
echo "<li> {$contacts[0]['name']} : {$contacts[0]['email']} </li>\n";
echo "<li> {$contacts[1]['name']} : {$contacts[1]['email']} </li>\n";
echo "<li> {$contacts[2]['name']} : {$contacts[2]['email']} </li>\n";
echo "<li> {$contacts[3]['name']} : {$contacts[3]['email']} </li>\n";
echo "</ul>\n";