使用PHP preg_match_all提取XAMPP httpd-vhosts.conf未注释虚拟主机

需求 #

使用PHP的preg_match_all函数从XAMPP的httpd-vhosts.conf配置中提取有效虚拟主机，排除所有带#/##前缀的注释条目，最终输出结构化数组，包含每个有效虚拟主机的ServerName和DocumentRoot字段。

正确实现代码 #

<?php
// 待匹配的配置内容
$str = '# Virtual Hosts
#
# Required modules: mod_log_config

# If you want to maintain multiple domains/hostnames on your
# machine you can setup VirtualHost containers for them. Most configurations
# use only name-based virtual hosts so the server doesn\'t need to worry about
# IP addresses. This is indicated by the asterisks in the directives below.
#
# Please see the documentation at 
# <URL:http://httpd.apache.org/docs/2.4/vhosts/>
# for further details before you try to setup virtual hosts.
#
# You may use the command line option \'-S\' to verify your virtual host
# configuration.

#
# Use name-based virtual hosting.
#
##NameVirtualHost *:80
#
# VirtualHost example:
# Almost any Apache directive may go into a VirtualHost container.
# The first VirtualHost section is used for all requests that do not
# match a ##ServerName or ##ServerAlias in any <VirtualHost> block.
#
##<VirtualHost *:80>
    ##ServerAdmin webmaster@dummy-host.example.com
    ##DocumentRoot "D:/xampp/htdocs/dummy-host.example.com"
    ##ServerName dummy-host.example.com
    ##ServerAlias www.dummy-host.example.com
    ##ErrorLog "logs/dummy-host.example.com-error.log"
    ##CustomLog "logs/dummy-host.example.com-access.log" common
##</VirtualHost>

##<VirtualHost *:80>
    ##ServerAdmin webmaster@dummy-host2.example.com
    ##DocumentRoot "D:/xampp/htdocs/dummy-host2.example.com"
    ##ServerName dummy-host2.example.com
    ##ErrorLog "logs/dummy-host2.example.com-error.log"
    ##CustomLog "logs/dummy-host2.example.com-access.log" common
##</VirtualHost>



##<VirtualHost *:8080>
    ##ServerName CI1
    ##DocumentRoot D:\xampp\htdocs\codeigniter_1\public
##</VirtualHost>

<VirtualHost *:8080>
    ServerName CI2
    DocumentRoot D:\xampp\htdocs\codeigniter_2\public
</VirtualHost>

<VirtualHost *:8080>
    ServerName CI3
    DocumentRoot D:\xampp\htdocs\codeigniter_3\public
</VirtualHost>';

/**
 * 提取有效虚拟主机列表
 * @param string $confContent httpd-vhosts.conf配置内容
 * @return array
 */
function getValidVirtualHosts(string $confContent): array
{
    $result = [];
    // 第一步：匹配所有未被注释的VirtualHost块
    preg_match_all('/^\s*<VirtualHost\b[^>]*>(.*?)<\/VirtualHost>/ims', $confContent, $hostBlocks);
    if (empty($hostBlocks[1])) return $result;
    
    foreach ($hostBlocks[1] as $blockContent) {
        // 第二步：提取当前块中的ServerName和DocumentRoot，跳过注释行
        $hostInfo = [];
        // 匹配ServerName
        if (preg_match('/^\s*ServerName\s+(\S+)/im', $blockContent, $m)) {
            $hostInfo['ServerName'] = $m[1];
        }
        // 匹配DocumentRoot，处理带引号和不带引号的情况
        if (preg_match('/^\s*DocumentRoot\s+["\']?([^"\'\r\n]+)["\']?/im', $blockContent, $m)) {
            $hostInfo['DocumentRoot'] = $m[1];
        }
        if (!empty($hostInfo)) $result[] = $hostInfo;
    }
    return $result;
}

// 调用测试
$vhosts = getValidVirtualHosts($str);
print_r($vhosts);
?>

输出结果 #

Array
(
    [0] => Array
        (
            [ServerName] => CI2
            [DocumentRoot] => D:\xampp\htdocs\codeigniter_2\public
        )

    [1] => Array
        (
            [ServerName] => CI3
            [DocumentRoot] => D:\xampp\htdocs\codeigniter_3\public
        )
)

正则规则说明 #

• 匹配未注释VirtualHost块的正则/^\s*<VirtualHost\b[^>]*>(.*?)<\/VirtualHost>/ims：
  • ^配合m修饰符匹配每行开头，自动过滤带#前缀的注释行
  • s修饰符让.可以匹配换行符，实现跨行匹配
  • 非贪婪匹配.*?保证每个闭合标签对应单独的VirtualHost块
• 提取字段的正则增加^\s*匹配行首空白，自动排除块内的注释行

内容的提问来源于stack exchange，提问作者Sanjeev