How to use multidimensional arrays and how to sort a multidimensional array with PHP

The following example shows how to use two-dimensional arrays and how to order the elements.

<style type="text/css">
	div.table  {
		float:left;
		font-family: Verdana;
		font-size:12px;
		margin:15px;
	}
	table {
		border:1px solid #aaa;
		border-collapse:collapse;
		width:160px;
	}
	 
	th {
		background-color:#777;
		color:#fff;
		font-size:12px;
		text-align:left;
	}
	
	td {
		background-color:#fff;
		font-size:12px;
	}
	
	td.ordered {
		background-color:#ffffe0;
		font-size:12px;
	}
</style>

<?php
// Create a multidimensional array
$people = array(
			array(	"Maria",
					"Valery",
					"Roxsana",
					"Lisa",
					"Deborah",
					"Barbara",
					"Carla",
					"Sophie",
					"Nadya",	
					"Enya"
				),
			array(32,28,35,33,37,35,25,35,28,33)
			);
			
// Print unordered list
echo("<div class='table'>");
echo("Unordered list");
echo("<table border='1' >");
echo("<tr>");
echo("<tr><th>Name</th><th>Age</th></tr>");

for($n=0; $n < count($people[0]); $n++)
	{
	echo("<tr>");
	echo("<td>" . $people[0][$n] . "</td>");
	echo("<td>" . $people[1][$n] . "</td>");
	echo("</tr>");
	}
echo("</table>");
echo("</div>");

// Sort the array by name
array_multisort($people[0],SORT_ASC, SORT_STRING,
				$people[1],SORT_NUMERIC);


// Print list sorted by name
echo("<div class='table'>");
echo("List sorted by name");
echo("<table border='1' width='140px'>");
echo("<tr>");
echo("<tr><th>Name</th><th>Age</th></tr>");
for($n=0; $n < count($people[0]); $n++)//  as $peopleName)
	{
	echo("<tr>");
	echo("<td class='ordered'>" . $people[0][$n] . "</td>");
	echo("<td>" . $people[1][$n] . "</td>");
	echo("</tr>");
	}
echo("</table>");
echo("</div>");

// Sort the array by age
array_multisort($people[1],SORT_ASC, SORT_NUMERIC,
				$people[0],SORT_STRING);
				

// Print list sorted by age				
echo("<div class='table'>");
echo("List sorted by age");
echo("<table border='1' width='140px'>");
echo("<tr>");
echo("<tr><th>Name</th><th>Age</th></th>");
for($n=0; $n < count($people[0]); $n++)//  as $peopleName)
	{
	echo("<tr>");
	echo("<td>" . $people[0][$n] . "</td>");
	echo("<td class='ordered'>" . $people[1][$n] . "</td>");
	echo("</tr>");
	}
echo("</table>");
echo("</div>");
?>

Here is the result for the sample: