I had Apache server running with PHP 5.6 using mod_php but needed PHP 7.3 for a particular application.
In order to have both installed at the same time I wanted to continue to use PHP 5.6 for all sites but only enable PHP 7.3 for a particular VirtualHost. To do this I continued to use mod_php for v5.6 and installed PHP-FPM for v7.3.
With the “remi” repo activated install “php73” (you should also install whatever other PHP 7.3 extensions you want):
yum install php73-php php73-php-fpm
Once installed you need to start the FPM server:
systemctl start php73-php-fpm
systemctl enable php73-php-fpm
In the configuration file for the VirtualHost that you wish to use v7.3
After updating the configuration file you’ll need to restart Apache:
systemctl restart httpd
Finally, if you need to run v7.3 of PHP from the command line enable it for the current session with:
scl enable php73 bash
or to enable for all sessions create an autoload file for bash in /etc/profile.d/php73.sh with the following content:
export X_SCLS="`scl enable php73 'echo $X_SCLS'`"