WordPress使用久了，数据库里面有很多没用的东西，下面分享一个删除多余数据的代码，

//wordpress数据库多余数据删除
$hostname_blog = "localhost";//填写数据库主机，同wp-config.php
$database_blog = "user";//填写数据库名，同wp-config.php
$username_blog = "user";//填写数据库用户名，同wp-config.php
$password_blog = "password";//设定数据库密码，同wp-config.php
$blog = mysql_pconnect($hostname_blog, $username_blog, $password_blog) or trigger_error(mysql_error(),E_USER_ERROR);
mysql_select_db($database_blog, $blog);
mysql_query('DELETE FROM wp_posts WHERE post_type = "revision"');
mysql_query('DELETE FROM wp_postmeta WHERE meta_key = "_edit_lock"');
mysql_query('DELETE FROM wp_postmeta WHERE meta_key = "_edit_last"');
mysql_query('DELETE FROM wp_commentmeta WHERE meta_key LIKE "%trash%"');
mysql_query('DELETE FROM wp_comments WHERE comment_approved = "trash"');
mysql_query('DELETE FROM wp_options WHERE option_name REGEXP "_transient_"');
mysql_query('DELETE FROM wp_postmeta WHERE meta_key = ‘_wp_attached_file’');
mysql_query('DELETE FROM wp_postmeta WHERE meta_key = ‘_wp_attachment_metadata’');
mysql_query("delete from wp_posts where (post_status='auto-draft' or post_status='inherit') and post_type='post'");
$tablelist = mysql_query("SHOW TABLES");
while($checklist = mysql_fetch_array($tablelist)) {
       $optimization=mysql_query("OPTIMIZE TABLE `$checklist[0]`");
}echo '清理完成!';
?>

在上面的代码第一句添加< ?php然后保存为
clean.php文件，上传到网站的目录，直接用浏览器打开这个文件就可以了。
或者使用下面的语句，删除自己想删除的内容

DELETE FROM wp_posts WHERE post_type = "revision"
DELETE FROM wp_postmeta WHERE meta_key = "_edit_lock"
DELETE FROM wp_postmeta WHERE meta_key = "_edit_last"
DELETE FROM wp_commentmeta WHERE meta_key LIKE "%trash%"
DELETE FROM wp_comments WHERE comment_approved = "trash"
DELETE FROM wp_options WHERE option_name REGEXP "_transient_"
DELETE FROM wp_postmeta WHERE meta_key = "_wp_attached_file"
DELETE FROM wp_postmeta WHERE meta_key = "_wp_attachment_metadata"
DELETE FROM wp_posts where (post_status='auto-draft' or post_status='inherit') and post_type='post'

直接登录phpmyadmin中运行sql语句就OK了，执行sql语句前请备份数据库以防万一。