url for downloading a PHP 5 version release - for using with https://github.com/CHH/php-build/commit/226802e28591287c11b240943876d21b03aec2f4#

1-urlRelease.php

<?php
/**
 * returns url for downloading a PHP 5 version release 
 * Check if the release is on museum.php.net, otherwise, use distributions url
 * 
 * @param  string $version format X.Y.Z
 * @return string url
 */
function urlRelease($version)
{
    $urlDistribution = 'http://www.php.net/distributions/php-{version}.tar.bz2';
    $urlMuseum       = 'http://museum.php.net/php5/php-{version}.tar.bz2';
    $urlApiReleases = 'http://www.php.net/releases/index.php?serialize=1&version=5.5.6&max=1000';
    $listReleases = unserialize(file_get_contents($urlApiReleases));


    if (isset($listReleases[$version]['museum'])) {
        return str_replace('{version}', $version, $urlMuseum);
    }

    return str_replace('{version}', $version, $urlDistribution);
}

2-testUrlRelease.php

<?php

$releases = [
    '5.5.9',
    '5.4.0',
];

foreach ($releases as $version) {
    printf('Version: %s - Url: %s <br>', $version, urlRelease($version));
}

3-urlRelease-test-release-out-of-museum.phpt

--TEST--
Release out of museum
--FILE--
<?php echo urlRelease('5.5.9'); ?>
--EXPECT--
http://www.php.net/distributions/php-5.5.9.tar.bz2

4-urlRelease-test-release-in-museum.phpt

--TEST--
Release in museum
--FILE--
<?php echo urlRelease('5.4.0'); ?>
--EXPECT--
http://museum.php.net/php5/php-5.4.0.tar.bz2