Hi,
*** Warning This feature was DEPRECATED in PHP 7.1.0, and REMOVED in PHP 7.2.0.
> I have a fair bit of complex code that depends on 'mcrypt' functionality.
Locally, you use a PHP version < 7.1.0, for example 7.0.33 or 5.6.40 to check that all your mcrypt features work perfectly.
From there, you make a copy of the local site to put it under another VirtualHost and it is this new local site that you will run under PHP 7.1.0 or 7.2.0 or 7.3.8 to modify your functions that used mcrypt. This way, you are safe, the original site still exists and is not modified.
My previous answer may have seemed a little "sharp" to you, but this forum is intended to help you run Wampserver correctly, not to fix PHP scripts or SQL queries.
RiggFolly's signature, mine, and the Documentation items in the Apache, PHP, MySQL and MariaDB menus of Wampmanager provide links to the official documentation.
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Documentation Apache -
Documentation PHP -
Documentation MySQL -
Wampserver install files & addons