#!/usr/bin/php -q
<?php

/**
* Date: 2/7/2002
*
* This script will backup  a database on a daily,
* weekly and monthly basis.  This script will keep only
* 7 daily backups, 4 weekly backups and 12 monthly backups
*
*/

// This directory you specify below expects the following subdirectories: daily/, weekly/, monthly/
$backup_dir = '/home/tony/backups/';

// MySQL Acccount info.  This should not be world readable unless you don't mind your
// mysql info being viewed.
$mysqlhost = 'localhost';
$mysqluser = 'geeklog';
$mysqlpass = '';

// The database you want to backup 
$database = 'geeklog';

// path to mysqldump
$mysqldump = '/usr/bin/mysqldump';

// Change this to point to the location of your tar
$tar_cmd = '/bin/tar';

/** You should not have to touch anything below here **/

/***********************
* DAILY BACKUP
***********************/
$backup_file = date('mdY') . '_daily_backup.sql';

$old_backups = getOldBackups($backup_dir . 'daily/');

// Sort results and remove oldest backup
if (sizeof($old_backups) > 6) {
    rsort($old_backups);
    $oldest_backup = array_pop($old_backups);
    unlink($backup_dir . "daily/$oldest_backup");
}

// Dump the database
exec("$mysqldump -h$mysqlhost -u$mysqluser -p$mysqlpass $database > " . $backup_dir . 'daily/' . $backup_file);
exec("$tar_cmd --directory $backup_dir" . "daily/ -czf $backup_dir" . "daily/$backup_file" . '.tar.gz ' . $backup_file);
unlink($backup_dir . 'daily/' . $backup_file);

/***********************
* WEEKLY BACKUP
***********************/
// If at end of week do weekly backup
if (date('w') == '0') {
    if ($old_backups = getOldBackups($backup_dir . 'weekly/')) {
        if (sizeof($old_backups) > 3) {
            rsort($old_backups);
            $oldest_backup = array_pop($old_backups);
            unlink($backup_dir . "weekly/$oldest_backup");
        }
    }
    copy($backup_dir . 'daily/' . $backup_file . '.tar.gz' , $backup_dir . 'weekly/' . str_replace('daily','weekly',$backup_file) . '.tar.gz');
}

/***********************
* WEEKLY BACKUP
***********************/
// If at end of month do monthly backup
if (date('d') == '01') {
    if ($old_backups = getOldBackups($backup_dir . 'monthly/')) {
        if (sizeof($old_backups) == 12) {
            rsort($old_backups);
            $oldest_backup = array_pop($old_backups);
            unlink($backup_dir . "monthly/$oldest_backup");
        }
    }
    copy($backup_dir . 'daily/' . $backup_file . '.tar.gz', $backup_dir . 'monthly/' . str_replace('daily','monthly',$backup_file) . '.tar.gz');
}

/**
* This simply gets all the files in an directory and loads the
* file names into an array
*
*/
function getOldBackups($dir_path)
{
    if (!is_dir($dir_path)) return false;

    $fd = opendir($dir_path);
    $old_backups = array();
    $index = 1;
    while (($f = @readdir($fd)) == TRUE) {
        if (!is_dir($f)) {
            clearstatcache();
            $old_backups[$index] = $f;
            $index++;
        }
    }
    closedir($fd);

    return $old_backups;
}

?>