A guide on changing the PHP version of a domain in cPanel.
Instructions
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Login to the cPanel account you want to edit
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In the upper right hand corner search box, search for “multi” and select MultiPHP manager

- Make a note of the current PHP version
- Select an updated version of PHP from the dropdown on the right and click Apply

- Visit your site to confirm that the above change does not break it. If it does break the site, revert back to the original version.