.htaccess 添加.php扩展名（如果不存在）

我有下面的重写，但我想替换不带扩展名的URL.php如果用户最后用.php键入URL，我如何修改下面的重写脚本

# /m/yyy rule
RewriteRule ^m/([\w-]+)/?$ merchants/$1/index.php [L,NC]
# /m/yyy/abc rule
RewriteRule ^m/([\w-]+)/([\w-]+)$ merchants/$1/$2.php [L,NC]
# /m/yyy/abc/ rule
RewriteRule ^m/([\w-]+)/([\w-]+)/$ merchants/$1/$2/index.php [L,NC]

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对于所显示的示例，请使用具有以下规则的.htaccess文件。请确保在测试URL之前清除浏览器缓存

RewriteEngine ON
# metchants/yyy/index.php to redirect /m/yyy rule
RewriteRule ^merchants/([\w-]+)/index\.php/?$ m/$1 [R=301,L,NC]
# merchants/yyy/abc.php to redirect /m/yyy/abc rule
RewriteRule ^merchants/([\w-]+)([\w-]+)\.php/?$ m/$1/$2 [R=301,L,NC]
# merchants/yyy/xyz/abc.php to redirect /m/yyy/xyz/abc rule
RewriteRule ^merchants/([\w-]+)/([\w-]+)/index\.php/?$ m/$1/$2 [R=301,L,NC]

# To handle /m/yyy/index.php rewrite rule.
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule ^m/([\w-]+)/?$ merchants/$1/index.php [QSA,L,NC]

# To handle /m/yyy/abc/index.php rewrite rule.
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule ^m/([\w-]+)/([\w-]+)$ merchants/$1/$2.php [QSA,L,NC]

# To handle /m/yyy/xyz/abc/index.php rewrite rule.
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule ^m/([\w-]+)/([\w-]+)/$ merchants/$1/$2/index.php [QSA,L,NC]

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你能加几个吗examples@Kelvin，你能告诉我这是否对你有效吗？非常感谢。