2的解决方案会循环，但修复起来很简单，只需在第2部分和第3部分的文件中沿着以下代码行：

#If the Browser request contains a .php, instruct the browser to remove it.
RewriteCond %{THE_REQUEST}      \.php      [NC]
RewriteRule ^/?(.*)\.php$       http://%{HTTP_HOST}/$1         [R=301,NC,L]

#If a request is received for a non file-system object, that doesn't have a .php suffix, then store the full path, filename, and URI in a variables with that extention.
RewriteCond %{SCRIPT_FILENAME} !-d
RewriteCond %{SCRIPT_FILENAME} !-s
RewriteCond %{SCRIPT_FILENAME} !-f
RewriteCond %{SCRIPT_FILENAME} !^\.php$  [NC]
RewriteRule ([^/]+)$      -  [E=testScript:%{SCRIPT_FILENAME}.php,E=testFile:$1.php,E=testURI:%{REQUEST_URI}.php]

#See if the file exists with a .php extention, if it does internally rewrite
RewriteCond %{ENV:testScript} -s  [OR]
RewriteCond %{ENV:testScript} -f
RewriteRule .*              %{ENV:testURI} [L]

#Else if a ENV:testDile is set, then pass the name to the php script
RewriteCond %{ENV:testFile} !^$
RewriteRule .*               /filechecker.php?page=%{ENV:testFile} [L]

仅供参考：Apache mod_rewrite文档值得一读，如果您不清楚上面的规则是做什么的，或者如果您想要一些更抽象的东西，请考虑下面的post。