不需要在数据库备份中涉及PHP。您只需要使用 mysqldump 备份数据库的脚本，和设置CRON作业以定期执行脚本：

  mysqldump db_name> backup-file.sql 
 

...将备份您的数据库到一个文件，通过重定向输出mysqldump到指定的文件名。

Peter提出了一个好处，命令只会给你一天的归档 - 任何归档两天的老被覆盖。这将允许您滚动日志七天：

  CURRENT_DAY_OF_WEEK =`date'+％u'` 
 FILENAME =mysqlbackup _$ CURRENT_DAY_OF_WEEK.sql

 mysqldump db_name> $ FILENAME 
 

请注意，文件权限将适用 - 如果用户执行该脚本没有该文件夹的权限。

I have a pretty large db in MySql, and I need to take backups of it every day or so.

I need to be able to take backups from any computer, so therefore I thought about making a php script to do this and put this php script online (offcourse with password protection and authorization etc so that only I can access it).

I wonder however, how is this done properly?

What commands should I use, and is it possible to change settings of the backup (for instance Add AUTO_INCREMENT value = true)?

I would appreciate examples...

Also, if this is a bad method (unsafe, or maybe gives bad backups with bad sql files), what other method would be preferred? I have shell-access and I have a VPS (ubuntu server).

My Mysql version is 5.1

Thanks

There's no need to involve PHP in the database backup. You just need a script that uses mysqldump to backup the database, and setup a CRON job to periodically execute the script:

mysqldump db_name > backup-file.sql

...will backup your database to a file, by redirecting the output from the mysqldump to the specified file name.

Peter brought up a good point, that the command would only give you one day of archiving--any archive over two days old would be overwritten. This would allow you have a rolling log going back seven days:

CURRENT_DAY_OF_WEEK=`date '+%u'`
FILENAME="mysqlbackup_"$CURRENT_DAY_OF_WEEK".sql"

mysqldump db_name > $FILENAME

Also be aware that file permissions will apply - can't write a file if the user executing the script doesn't have permissions to the folder.