AVS30 program analysis 1

#如果服务器报500错误注释这2行
Options -Indexes
Options +FollowSymLinks

#反注释下面几行，如果你想使用图片缓存
#<IfModule mod_expires.c>
#  ExpiresActive On
#  ExpiresDefault A1209600
#  ExpiresByType text/html A1
#</IfModule>

# Uncomment following lines if Apache doesnt support MultiViews!
<IfModule mod_rewrite.c>
    RewriteEngine On

        # Uncomment the 2 lines below if you are using www.domain.com
        # as the baseurl for the site and users access your site
        # via domain.com (THIS IS REQUIRED FOR JQUERY TO WORK)
        #如果访问的不带www的域名则跳转到带www的域名
        #e.g.: baidu.com => www.baidu.com
        RewriteCond %{HTTP_HOST} ^domain.com [NC]
        RewriteRule ^(.*)$ http://www.domain.com/$1 [L,R=301]

    RewriteCond %{REQUEST_FILENAME} !-f  #如果请求的不是文件
    RewriteCond %{REQUEST_FILENAME} !-d  #如果请求的不是目录
    RewriteRule .* loader.php [L,QSA]    #重写到loader.php处理请求
</IfModule>

	location / 
	{
		#-f 判断是否文件
		#-d 判断是否目录
		#-e 判断是否文件或目录
		if (!-e $request_filename){
			rewrite ^(.*)$ /loader.php last;
		}
	}

<?php
//die(&#39;Only enable this script if you dont have support for MultiViews&#39;);
$relative = &#39;&#39;;
$loaders  = array(
    &#39;ajax&#39; => 1,
    'album' => 1,
    'albums' => 1,
    'blog' => 1,
    'blogs' => 1,
    'captcha' => 1,
    'categories' => 1,
    'community' => 1,
    'confirm' => 1,
    'error' => 1,
    'feedback' => 1,
    'feeds' => 1,
    'game' => 1,
    'games' => 1,
    'index' => 1,
    'invite' => 1,
    'loader' => 1,
    'login' => 1,
    'logout' => 1,
    'lost' => 1,
    'mail' => 1,
    'notice' => 1,
    'notices' => 1,
    'photo' => 1,
    'requests' => 1,
    'search' => 1,
    'signup' => 1,
    'static' => 1,
    'stream' => 1,
    'upload' => 1,
    'user' => 1,
    'users' => 1,
    'video' => 1,
    'videos' => 1,
    'edit' => 1
);
$query      = ( isset($_SERVER['QUERY_STRING']) ) ? $_SERVER['QUERY_STRING'] : NULL;
$request    = str_replace($relative, '', $_SERVER['REQUEST_URI']);
$request    = str_replace('?' .$query, '', $request);
$request    = explode('/', trim($request, '/'));
if (isset($request['0'])) {
    $page   = $request['0'];
    if (isset($loaders[$page])) {
        require $page. '.php';
    } else {
		header('HTTP/1.0 404 Not Found');
  		die();
	}
} else {
	header('HTTP/1.0 404 Not Found');
    die();
}