如何通过.htaccess将带.php后缀旧URL重定向到无后缀SEO友好URL

问题背景 #

我的网站旧URL结构如下：

https://example.com/login.php
or, 
https://example.com/login.php?redirect=https://example.com
or,
https://example.com/register.php

重构URL后，新URL结构为：

https://example.com/login
or, 
https://example.com/login?redirect=https://example.com
or,
https://example.com/register

希望用户访问旧URL时自动重定向到对应的新URL，现有.htaccess文件内容如下：

AddDefaultCharset UTF-8

ErrorDocument 404 /error-404/

##
Options +FollowSymlinks -MultiViews
RewriteEngine on
RewriteBase /

## Allow a few SEO Files direct access.
RewriteRule ^robots.txt?$ robots.txt [L]
RewriteRule ^ads.txt?$ ads.txt [L]
RewriteRule ^sellers.json?$ sellers.json [L]


## Avoid rewriting rules for the admin section
RewriteRule ^(admin|resources)($|/) - [L]

## Set Ajax Request File
RewriteRule ^kahuk-ajax.php?$ kahuk-ajax.php? [L,QSA]

## Set controller with id
RewriteRule ^([^/]+)/([0-9]+)/?$ index.php?con=$1&id=$2 [L,QSA]

## Set controller with slug
RewriteRule ^([^/]+)/([^/]+)/?$ index.php?con=$1&slug=$2 [L,QSA]

## For paging
RewriteRule ^([^/]+)/page/([0-9]+)/?$ index.php?con=$1&page=$2 [L,QSA]
RewriteRule ^([^/]+)/([^/]+)/page/([0-9]+)/?$ index.php?con=$1&slug=$2&page=$3 [L,QSA]

## Set controller for only one parameter
RewriteRule ^page/([^/]+)/?$ index.php?con=page&slug=$1 [L,QSA]
RewriteRule ^([^/]+)/?$ index.php?con=$1 [L,QSA]

## Set home page
RewriteRule ^/?$ index.php?con=home [L]

实现方法 #

要实现旧URL到新URL的重定向，需要在.htaccess的RewriteEngine on和RewriteBase /之后添加专门的重写规则，必须放在其他重写规则之前，确保旧URL优先被匹配处理。

添加的规则如下：

## 重定向旧的.php登录/注册URL到新URL
RewriteRule ^login\.php$ /login [R=301,L,QSA]
RewriteRule ^register\.php$ /register [R=301,L,QSA]

规则说明 #

• ^login\.php$：精确匹配以login.php结尾的旧URL
• /login：对应的新URL路径
• R=301：设置永久重定向，对搜索引擎SEO友好
• L：标记为最后执行的规则，匹配后不再处理后续规则
• QSA：自动保留原URL的查询参数（比如redirect参数会完整传递到新URL中）

修改后的完整.htaccess文件 #

AddDefaultCharset UTF-8

ErrorDocument 404 /error-404/

##
Options +FollowSymlinks -MultiViews
RewriteEngine on
RewriteBase /

## 重定向旧的.php登录/注册URL到新URL
RewriteRule ^login\.php$ /login [R=301,L,QSA]
RewriteRule ^register\.php$ /register [R=301,L,QSA]

## Allow a few SEO Files direct access.
RewriteRule ^robots.txt?$ robots.txt [L]
RewriteRule ^ads.txt?$ ads.txt [L]
RewriteRule ^sellers.json?$ sellers.json [L]


## Avoid rewriting rules for the admin section
RewriteRule ^(admin|resources)($|/) - [L]

## Set Ajax Request File
RewriteRule ^kahuk-ajax.php?$ kahuk-ajax.php? [L,QSA]

## Set controller with id
RewriteRule ^([^/]+)/([0-9]+)/?$ index.php?con=$1&id=$2 [L,QSA]

## Set controller with slug
RewriteRule ^([^/]+)/([^/]+)/?$ index.php?con=$1&slug=$2 [L,QSA]

## For paging
RewriteRule ^([^/]+)/page/([0-9]+)/?$ index.php?con=$1&page=$2 [L,QSA]
RewriteRule ^([^/]+)/([^/]+)/page/([0-9]+)/?$ index.php?con=$1&slug=$2&page=$3 [L,QSA]

## Set controller for only one parameter
RewriteRule ^page/([^/]+)/?$ index.php?con=page&slug=$1 [L,QSA]
RewriteRule ^([^/]+)/?$ index.php?con=$1 [L,QSA]

## Set home page
RewriteRule ^/?$ index.php?con=home [L]

内容的提问来源于stack exchange，提问作者Shah Alom