Compiled PHP 7 missing mysql extension in WordPress

Question

I have built PHP 7 with a configuration that worked for a previous version of PHP. Now my WordPress websites get the message:

Your PHP installation a

Answer 1

As has been mentioned elsewhere, the ext/mysql functions have been removed. We've been talking about this for some time.

ext/mysql was built for MySQL 3.23 and only got very few additions since then while mostly keeping compatibility with this old version which makes the code a bit harder to maintain.

If you're hell-bent on putting them back in, you can add them back to PHP 7 by using the ext/mysql PECL Library

It's important to note that Wordpress 3.9 or later supports mysqli

In WordPress 3.9, we added an extra layer to WPDB, causing it to switch to using the mysqli PHP library, when using PHP 5.5 or higher.