Array manipulation exercise @ PHP.

PHP_Exercise.php

<?php
$data = array(
	array(1,2,3,4,8),
	array(5,6,7,9,14),
	array(10,11,12,13,18),
	array(20,19,17,16,15)
);

// Output the numbers in order, comma spereated
// 1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20

$results = array();

foreach ($data AS $segment) {
	$results = array_merge($results, $segment);
}

sort($results);

echo implode(',', $results);