什么会导致PHP变量由服务器改写？ [英] What would cause PHP variables to be rewritten by the server?

问题描述

我在我公司安装网络软件给出一个虚拟机。但是，我遇到了一个相当奇特的问题，即PHP变量将由服务器，如果他们匹配特定的模式覆盖（重写）。什么可以重写PHP变量这样？

I was given a VM at my company to install web software on. But I came across a rather bizarre issue where PHP variables would be overwritten (rewritten) by the server if they matched a specific pattern. What could rewrite PHP variables like this?

下面是作为一个完整独立的脚本。

The following is as an entire standalone script.

<?php
$foo = 'b.domain.com';
echo $foo; // 'dev01.sandbox.b.domain.com'

$bar = 'dev01.sandbox.domain.com';
echo $bar; // 'dev01.sandbox.sandbox.domain.com'

$var = 'b.domainfoo.com';
echo $var; // 'b.domainfoo.com' (not overwritten because it didn't match whatever RegEx has been set)
?>

从本质上讲它包含一个子域和域名匹配的任何变量将被改写。这不是mod_rewrite的将能够触及，所以它必须是在服务器级别的东西是解析出PHP和重写一个字符串，如果它正则表达式匹配。

Essentially any variable which contains a subdomain and matches on the domain name would be rewritten. This isn't something mod_rewrite would be able to touch, so it has to be something at the server level that is parsing out PHP and rewriting a string if it matches a RegEx.

推荐答案

输出改写可能范围内的Apache使用的mod_perl：PerlOutputFilterHandler

Output overwriting is possible within Apache by using mod_perl: PerlOutputFilterHandler.

以下可以被添加到的apache.conf设置输出滤波器：

The following could be added to an apache.conf to set the output filter:

<FilesMatch "\.(html?|php|xml|css)$">
    PerlSetVar Filter On
    PerlHandler MyApache2::FilterDomain
    PerlOutputFilterHandler MyApache2::FilterDomain
</FilesMatch>

例过滤处理code：

Example filter handler code:

#file:MyApache2/FilterDomain.pm
#--------------------------------
package MyApache2::FilterDomain;

use strict;
use warnings;

use Apache2::Filter();
use Apache2::RequestRec();
use APR::Table();

use Apache2::Const -compile => qw(OK);

use constant BUFF_LEN => 1024;

sub handler {
    my $f = shift;
    my @hostname = split(/\./, $f->r->hostname);
    my $new_hostname = $hostname[0].".".$hostname[1];

    unless ($f->ctx) {
        $f->r->headers_out->unset('Content-Length');
        $f->ctx(1);
    }

    while ($f->read(my $buffer, BUFF_LEN)) {
        $buffer =~ s/([a-z0-9]+)+\.domain\./$new_hostname\.$1.domain\./g;   
        $f->print($buffer);
    }

    return Apache2::Const::OK;
}
1;

更多关于Apache mod_perl的过滤器可以在这里找到：的mod_perl：输入和输出滤波器

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