PHP奇怪的DOCUMENT_ROOT

Question

基本上,我正在编写一个框架,作为其功能的一部分,它应该为最终开发人员提供一组完善的URI /路径.

这些路径中的两个使用$_SERVER['DOCUMENT_ROOT']:

/**
 * Absolute filesystem path to web root install (aka docroot).
 * @example "C:/wamp/www" OR "/home/visitgoz/public_html/"
 */
CFG::set('ABS_WWW',
    str_replace(
        $tmpseps,
        DIRECTORY_SEPARATOR,
        truepath($_SERVER['DOCUMENT_ROOT']).'/'
    )
);

/**
 * K2F path relative to web root.
 * @example /K2F/
 */
CFG::set('REL_K2F',
    str_replace(
        array('//','\\'),
        '/',
        str_replace(CFG::get('ABS_WWW'),'/',CFG::get('ABS_K2F'))
    )
);

该代码已经过微调,可以在Linux和Windows上运行.显然,它大部分时间都在Linux上运行,实际上在VPS上非常无缝.

但是,最近,我在HG转销商帐户(共享托管)上试了一下,这一切都破了.我在有问题的机器上打印出$ _SERVER中的数据:

Array
(
**  [DOCUMENT_ROOT] => /usr/local/apache/htdocs
    [GATEWAY_INTERFACE] => CGI/1.1
    [HTTP_ACCEPT] => text/html,application/xhtml+xml,application/xml;q=0.9;q=0.8
    [HTTP_ACCEPT_CHARSET] => ISO-8859-1,utf-8;q=0.7,*;q=0.7
    [HTTP_ACCEPT_ENCODING] => gzip,deflate
    [HTTP_ACCEPT_LANGUAGE] => en-gb,en;q=0.5
    [HTTP_CONNECTION] => keep-alive
    [HTTP_COOKIE] => <snip>
    [HTTP_HOST] => <snip>
    [HTTP_KEEP_ALIVE] => 115
    [HTTP_USER_AGENT] => <snip>
    [PATH] => /bin:/usr/bin
    [QUERY_STRING] => 
    [REDIRECT_STATUS] => 200
    [REMOTE_ADDR] => <snip>
    [REMOTE_PORT] => 49262
    [REQUEST_METHOD] => GET
    [REQUEST_URI] => /~sitename/
**  [SCRIPT_FILENAME] => /home/sitename/public_html/index.php
    [SCRIPT_NAME] => /~sitename/index.php
    [SERVER_ADDR] => <snip>
    [SERVER_ADMIN] => <snip>
    [SERVER_NAME] => <snip>
    [SERVER_PORT] => 80
    [SERVER_PROTOCOL] => HTTP/1.1
    [SERVER_SIGNATURE] => 
Apache mod_fcgid/2.3.5 mod_auth_passthrough/2.1 mod_bwlimited/1.4 FrontPage/5.0.2.2635 Server at <snip> Port 80


    [SERVER_SOFTWARE] => Apache mod_fcgid/2.3.5 mod_auth_passthrough/2.1 mod_bwlimited/1.4 FrontPage/5.0.2.2635
    [UNIQUE_ID] => TVox-Eo1Z8IAAG1kAh4AAAEZ
    [PHP_SELF] => /~sitename/index.php
    [REQUEST_TIME] => 1297756668
    [argv] => Array
        (
        )

    [argc] => 0
)

而我的机器:

Array
(
    [HTTP_AUTHORIZATION] => 
    [HTTP_HOST] => <snip>
    [HTTP_USER_AGENT] => <snip>
    [HTTP_ACCEPT] => text/html,application/xhtml+xml,application/xml;q=0.9;q=0.8
    [HTTP_ACCEPT_LANGUAGE] => en-gb,en;q=0.5
    [HTTP_ACCEPT_ENCODING] => gzip,deflate
    [HTTP_ACCEPT_CHARSET] => ISO-8859-1,utf-8;q=0.7,*;q=0.7
    [HTTP_KEEP_ALIVE] => 115
    [HTTP_CONNECTION] => keep-alive
    [PATH] => <snip>
    [SystemRoot] => C:\Windows
    [COMSPEC] => C:\Windows\system32\cmd.exe
    [PATHEXT] => .COM;.EXE;.BAT;.CMD;.VBS;.VBE;.JS;.JSE;.WSF;.WSH;.MSC
    [WINDIR] => C:\Windows
    [SERVER_SIGNATURE] => 
    [SERVER_SOFTWARE] => Apache/2.2.11 (Win32) PHP/5.3.1
    [SERVER_NAME] => <snip>
    [SERVER_ADDR] => <snip>
    [SERVER_PORT] => 80
    [REMOTE_ADDR] => <snip>
**  [DOCUMENT_ROOT] => C:/wamp/www/
    [SERVER_ADMIN] => admin@localhost
**  [SCRIPT_FILENAME] => C:/wamp/www/K2F/cms/cms-joomla-1.5/index.php
    [REMOTE_PORT] => 49947
    [GATEWAY_INTERFACE] => CGI/1.1
    [SERVER_PROTOCOL] => HTTP/1.1
    [REQUEST_METHOD] => GET
    [QUERY_STRING] => 
    [REQUEST_URI] => /K2F/cms/cms-joomla-1.5/
    [SCRIPT_NAME] => /K2F/cms/cms-joomla-1.5/index.php
    [PHP_SELF] => /K2F/cms/cms-joomla-1.5/index.php
    [REQUEST_TIME] => 1297758541
)

**你应该读出的部分,应该完美地解释我的问题.

所以基本上,预期DOCUMENT_ROOT是/home/sitename/public_html/,但我得到了/usr/local/apache/htdocs.

哦,对不起,如果我有点过于冗长;)

编辑:

getcwd() => /home/visitgoz/public_html

__FILE__ => /home/visitgoz/public_html/K2F/config.php

Answer 1

那些(便宜的)Mass-Hosters经常做一些Apache URL重写技巧 - 这基本上使他们的生活变得更容易,因为只有一个Apache V-Host,所有共享网站都有一个Document-Root.

在这种情况下查找"真实"文档Root:

• 从左到右比较DOCUMENT_ROOT到SCRIPT_FILENAME.如果没有匹配的Path-Components,那就是这样的共享主机.
• 如果它是这样的共享主机,请从示例中的SCRIPT_NAME =>"index.php"中删除REQUEST_URI.
• 然后:从SCRIPT_FILENAME =>您的DOCUMENT_ROOT(/ home/sitename/public_html /)的末尾删除上面的结果

编辑(Christian Sciberras): 这是正确的答案,但它缺少代码,无论如何我必须写,所以这里是:

if(strpos($_SERVER['SCRIPT_FILENAME'],$_SERVER['DOCUMENT_ROOT'])===false){
    // how it works on reseller accounts...
    $path=str_common(getcwd(),__FILE__);
}else{
    // how it normally works...
    $path=truepath($_SERVER['DOCUMENT_ROOT']).'/';
}