Enable PHP Version Switching

Hello,

Yes the option is available in both WHM and cPanel called:

MultiPHP Manager

If you don't see this, you are running EasyApache3 in which you need to upgrade to EasyApache4.

How to Migrate Between EasyApache 3 and EasyApache 4 - EasyApache 4 - cPanel Documentation

Once you do, you can then install and allow switching from PHP 5.4, 5.5, 5.6, 7, and 7.1

 

It can cause issues yes, I'd recommend giving a maintenance period for your users, the web server usually goes down during the transition and depending on how slow/fast the server is the downtime can vary but usually 2~ minutes.

I'd also recommend changing the default PHP limits as the default ones are pretty low like memory_limit and upload file size, example by default I usually do:

Code:

sed -i 's/allow_url_fopen = Off/allow_url_fopen = On/g' /opt/cpanel/ea-php*/root/etc/php.ini
sed -i 's/max_execution_time = 30/max_execution_time = 120/g' /opt/cpanel/ea-php*/root/etc/php.ini
sed -i 's/max_input_time = 60/max_input_time = -1/g' /opt/cpanel/ea-php*/root/etc/php.ini
sed -i 's/memory_limit = 32M/memory_limit = 128M/g' /opt/cpanel/ea-php*/root/etc/php.ini
sed -i 's/upload_max_filesize = 2M/upload_max_filesize = 64M/g' /opt/cpanel/ea-php*/root/etc/php.ini

/scripts/restartsrv_apache

You can run that right in SSH, but change the actual options as you see fit.

If all hell breaks loose, and you are not sure what the issue is, you can revert back to EA3 as well.

 

Yes just run that, you are most likely not running the latest version of cPanel then as it was recently implemented to do the migration within WHM instead of using SSH

 

No problem!

 

For this goal I use - MultiPHP Manager.