CentOS7开发服务器多PHP版本配置：按子域名指定版本

Hey there! Let's work through this PHP version setup you need for your CentOS 7 dev server. You've already got PHP 5.4 (mod_php) and PHP 7.2 (FastCGI) installed, so we just need to wire Apache to serve the right version for each subdomain. Here's how to do it reliably:

1. 先确认PHP 7.2 FPM服务正常运行 #

First things first—make sure your PHP 7.2 FastCGI Process Manager (FPM) is up and running, and set to start on boot:

systemctl start php72-php-fpm
systemctl enable php72-php-fpm

Check its status to confirm it's active:

systemctl status php72-php-fpm

You should see active (running) in the output.

2. 配置Apache虚拟主机（推荐方式） #

Since each user has their own subdomain, setting the PHP version directly in the virtual host config is the most stable approach—it avoids user-facing .htaccess issues and keeps control centralized.

Step-by-step: #

• Locate the virtual host config file for the target subdomain. These are usually in /etc/httpd/conf.d/ or /etc/httpd/sites-available/, named something like user-subdomain.conf.
• Open the file and add this block inside the <VirtualHost> section to force the subdomain to use PHP 7.2 FPM:

<FilesMatch \.php$>
    SetHandler "proxy:unix:/run/php-fpm/php72-php-fpm.sock|fcgi://localhost/"
</FilesMatch>

Note: The socket path /run/php-fpm/php72-php-fpm.sock is the default for Remi's PHP 7.2 packages. If yours is different (check the listen directive in /etc/opt/remi/php72/php-fpm.d/www.conf), replace it with your actual socket path.

• For subdomains that need to stay on PHP 5.4, leave out this block—Apache will automatically use the mod_php version you already have.
• Test your Apache config for syntax errors before restarting:

apachectl configtest

If you see Syntax OK, restart Apache to apply changes:

systemctl restart httpd

3. 修复.htaccess方法（可选） #

If you want users to be able to set their own PHP version via .htaccess, you need to make sure Apache allows overrides and has the right modules loaded.

Step-by-step: #

• Verify Apache has mod_proxy and mod_proxy_fcgi enabled:

apachectl -M | grep proxy

You should see both proxy_module and proxy_fcgi_module listed. If not, add these lines to /etc/httpd/conf/httpd.conf and restart Apache:

LoadModule proxy_module modules/mod_proxy.so
LoadModule proxy_fcgi_module modules/mod_proxy_fcgi.so

• In the subdomain's virtual host config, ensure AllowOverride is set to All (or at least FileInfo) so .htaccess rules are applied:

<Directory "/var/www/html/user-subdomain-root">
    AllowOverride All
    # Keep your existing directory config here
</Directory>

• Users can then add this to their site's root .htaccess to switch to PHP 7.2:

<FilesMatch \.php$>
    SetHandler "proxy:unix:/run/php-fpm/php72-php-fpm.sock|fcgi://localhost/"
</FilesMatch>

4. 验证配置生效 #

For each subdomain, create a simple info.php file in the document root:

<?php phpinfo(); ?>

Visit http://your-subdomain/info.php and check the PHP Version at the top of the page—you should see either 5.4 or 7.2 depending on your config.

重要注意事项 #

• Since PHP 5.4 is End of Life (EOL), prioritize migrating users to PHP 7.2 as soon as possible to avoid security risks.
• Always run apachectl configtest before restarting Apache—bad configs can take your server offline.
• If you get 502 Bad Gateway errors, check the permissions on the PHP 7.2 FPM socket. Make sure the listen.owner and listen.group in /etc/opt/remi/php72/php-fpm.d/www.conf are set to apache, then restart the FPM service.

内容的提问来源于stack exchange，提问作者Papa Lopez