upgrade.php

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<?php
function elgg_set_processed_upgrades(array $processed_upgrades) {
    $processed_upgrades = array_unique($processed_upgrades);
    return datalist_set('processed_upgrades', serialize($processed_upgrades));
}

function elgg_get_upgrade_file_version($filename) {
    preg_match('/^([0-9]{10})([\.a-z0-9-_]+)?\.(php)$/i', $filename, $matches);

    if (isset($matches[1])) {
        return (int) $matches[1];
    }

    return false;
}

function elgg_get_upgrade_files($upgrade_path = null) {
    if (!$upgrade_path) {
        $upgrade_path = elgg_get_root_path() . 'engine/lib/upgrades/';
    }
    $upgrade_path = sanitise_filepath($upgrade_path);
    $handle = opendir($upgrade_path);

    if (!$handle) {
        return false;
    }

    $upgrade_files = array();

    while ($upgrade_file = readdir($handle)) {
        // make sure this is a well formed upgrade.
        if (is_dir($upgrade_path . '$upgrade_file')) {
            continue;
        }
        $upgrade_version = elgg_get_upgrade_file_version($upgrade_file);
        if (!$upgrade_version) {
            continue;
        }
        $upgrade_files[] = $upgrade_file;
    }

    sort($upgrade_files);

    return $upgrade_files;
}

function _elgg_upgrade_unlock() {
    global $CONFIG;
    delete_data("drop table {$CONFIG->dbprefix}upgrade_lock");
    elgg_log('Upgrade unlocked.', 'NOTICE');
}