Version to Integer

version2integer.php

<?php

function version2integer($version) {
    $matches = array();
    preg_match('/([0-9.]+)/', $version, $matches);

    if (count($matches) > 1) {
        $maxSequences = 4; // v12.34.56.78.90 will stop at 78
        $matches = explode('.', $matches[1]);
        $matches = $matches + array(0, 0, 0, 0);
    }

    $normalizedVersion = '';
    foreach ($matches as $match) {
        if (0 === $maxSequences) break;
        elseif (is_numeric($match)) {
            $hex = sprintf('%002x', (int)$match);
            $normalizedVersion .= $hex;
            --$maxSequences;
        }
    }

    return sprintf('%010d', hexdec($normalizedVersion));
}

// -----

$versions = array('1.1', '2.3','4.6.7', '4.3.0', '14.8', '123.9.0', '0.9', '4.7', '4.7.1', '4.6');

$integerVersions = array();
foreach ($versions as $version) {
    $integerVersion = version2integer($version);
    printf("%s => %s\n", $version, $integerVersion);
    $integerVersions[(int)$integerVersion] = $version;
}

ksort($integerVersions);
print_r($integerVersions);