CentOS7/Apache下已有PHP7时安装PHP5.6并配置特定虚拟主机

开发者阿泽

2026-5-21

Hey there! I’ve helped a bunch of folks set up multiple PHP versions on CentOS 7 with Apache, so let’s walk through this step by step to get your PHP 5.6-only code running on a specific virtual host while keeping PHP 7 intact.

1. Install PHP 5.6 alongside your existing PHP 7

CentOS 7’s default repos don’t include PHP 5.6, so we’ll use the Remi repository (a trusted source for updated PHP packages). Here’s how to get it set up:

First, install the required repository files:

sudo yum install -y epel-release
sudo yum install -y http://rpms.remirepo.net/enterprise/remi-release-7.rpm

Enable the Remi repo specifically for PHP 5.6:
```
sudo yum-config-manager --enable remi-php56
```

Install PHP 5.6 and common modules (note the php56- prefix to avoid conflicts with your existing PHP 7):

sudo yum install -y php56 php56-php-cli php56-php-fpm php56-php-mysqlnd php56-php-gd php56-php-xml php56-php-mbstring

Start the PHP 5.6 FPM service and set it to run automatically on system boot:
```
sudo systemctl start php56-php-fpm
sudo systemctl enable php56-php-fpm
```
Verify the service is running (look for "active (running)" in the output):
```
sudo systemctl status php56-php-fpm
```

2. Configure your specific virtual host to use PHP 5.6

We’ll use Apache’s mod_proxy_fcgi to route PHP requests for your target virtual host to the PHP 5.6 FPM process. Here’s the detailed setup:

First, make sure mod_proxy_fcgi is installed and enabled:

sudo yum install -y mod_proxy_fcgi
sudo systemctl restart httpd

Locate your Apache virtual host configuration directory (usually /etc/httpd/conf.d/ or /etc/httpd/sites-available/). Create or edit the config file for your target domain (e.g., legacy-app.conf):

<VirtualHost *:80>
    ServerName your-legacy-app-domain.com
    ServerAlias www.your-legacy-app-domain.com
    DocumentRoot /var/www/legacy-app/public_html

    # Disable mod_php to prevent PHP 7 from handling requests for this domain
    php_admin_flag engine off

    # Route PHP requests to PHP 5.6 FPM
    <FilesMatch \.php$>
        # Check your PHP 5.6 FPM listen path first (see note below)
        SetHandler "proxy:unix:/run/php56-php-fpm/www.sock|fcgi://localhost"
    </FilesMatch>

    # Logging configuration (adjust paths to your preference)
    ErrorLog /var/log/httpd/legacy-app_error.log
    CustomLog /var/log/httpd/legacy-app_access.log combined
</VirtualHost>

Important note: To confirm the correct listen path for PHP 5.6 FPM, run this command:

grep 'listen =' /etc/opt/remi/php56/php-fpm.d/www.conf

If it returns a port like 127.0.0.1:9000 instead of a socket path, update the SetHandler line to:

SetHandler "proxy:fcgi://127.0.0.1:9000"

Create your app’s document root and set proper permissions for Apache:

sudo mkdir -p /var/www/legacy-app/public_html
sudo chown -R apache:apache /var/www/legacy-app/public_html
sudo chmod -R 755 /var/www/legacy-app/public_html

Test your Apache configuration for syntax errors:
```
sudo apachectl configtest
```
If you see Syntax OK, restart Apache to apply the changes:
```
sudo systemctl restart httpd
```
Verify the setup works: Create a info.php file in your app’s document root with this content:
```
<?php phpinfo(); ?>
```
Visit http://your-legacy-app-domain.com/info.php in your browser—you should see PHP 5.6 listed as the active version.

内容的提问来源于stack exchange，提问作者user3181303