Simple software version comparer. Provides ability to compare an arbitrary number of version segments. Non numberic charters not supported

gistfile1.php

<?php

function compare_versions(
	$version, $compareVersion, $lookup = array('greater' => 1, 'equal' => 0, 'less' => -1)
)
{
	$version = explode('.', $version);
	$compareVersion = explode('.', $compareVersion);

	$count = max(count($version), count($compareVersion));

	for ($i = 0; $i < $count; $i++)
	{
		if ( ! isset($version[$i])) $version[$i] = 0;
		if ( ! isset($compareVersion[$i])) $compareVersion[$i] = 0;

		if ($version[$i] > $compareVersion[$i])
		{
			return $lookup['greater'];
		}

		elseif ( ! isset($version[$i]) || $version[$i] < $compareVersion[$i])
		{
			return $lookup['less'];
		}
	}

	return $lookup['equal'];
}