Known Issues in WordPress When Upgrading PHP to ver 7

WordPress recommends PHP7 and MariaDB 10.0 or higher, so your core installation should be fine.

If you’re using any third-party plugins and/or themes (including ones you’ve written), you would be wise to ensure that they too are compatible with PHP7. Check the respective maintainers’ support streams (either the relevant plugin/theme pages on wordpress.org or the relevant sites if they’re downloaded / purchased from other venues).

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