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If you are a DreamHost user , you need to log in to your hosting account's control panel. Then, navigate to the 'Manage Websites' tab in the left panel.

In the list of sites, click on the three-dot menu and choose “PHP Version”.

Opening the Manage Websites section and clicking PHP Version in DreamHost
You will be directed to the PHP Settings page in the control panel.

Choose a PHP version from the drop-down menu. Then click "Change PHP Version" to continue the update.

Changing the PHP version in DreamHost
How to Update Your PHP Version in WP Engine
WP Engine is a managed WordPress hosting company , which means it chinese overseas europe automatically upgrades the PHP version for you. However, you can also manually upgrade and downgrade the PHP version for your sites.

Simply log in to your WP Engine Dashboard. On the 'My Sites' page, click on the PHP version next to the site you selected.

Clicking the PHP number link in WP Engine
This will take you to your site's General Settings. Here, WP Engine has a feature that allows you to preview your site on the latest PHP version without changing the PHP version.

If you want to try it out, click on “PHP Preview…”.

The PHP Test Driver feature in WP Engine
To update PHP in WP Engine, scroll down to the “Updates” section.

Then click on the “PHP Version Number” link.

Changing the PHP version in WP Engine
All you have to do now is choose the 'Upgrade to PHP...' option.

Then click on the “Confirm” button.