The version of GD provided with Plesk PHP packages does not have support for webp enabled by default. Almost all browsers now support this format.
https://developers.google.com/speed/webp/

Add HHVM support

Argon2 is a new feature of PHP 7.2 as stated here: http://php.net/releases/720.php. It won the password hashing competition and is the recommended hashing algorithm.

It must be enabled my re-compiling PHP 7.2 with --with-password-argon2.

Add mcrypt module to Plesk PHP 7.2 and newer.
For previous PHP versions it's included out of the box.

Mcrypt 1.0.2 natively supports PHP 7.2+ (https://pecl.php.net/package/mcrypt/1.0.2)

It's, for example, required by Prestashop 1.7.x, which is quite popular among Plesk users.

As an alternative to edit PHP-FPM settings per Service Plan, it would be helpful to provide the possibility to setup PHP-FPM settings on the same place as global PHP.ini settings are available

For example, in Tools & Settings > PHP Settings > 7.x > Extensions > Edit PHP.ini and Edit PHP-FPM

We should be able to choose the default PHP version and handler to be assigned to new created domains/subscriptions/webspaces ; without using Service plan or Event Manager.
Thanks

We've had a similar suggestion before with insufficient information: https://plesk.uservoice.com/forums/184549-feature-suggestions/suggestions/34209229-add-php-handlers-restriction-per-service-plan

The idea is to be able to limit the number of available PHP handlers for selection at domain PHP settings.

This may be done at Service Plan X > Permissions.

Example: customer will be able to select only FPM server by Nginx.

This will allow the ability for more precise configuration.

Based on the support request.

It would be nice to have separate php-fpm error logs for each domain instead of logging everything in /var/log/plesk-php7x-fpm/.

When using the alternative PHP version supplied, it would be great if additional to OPCACHE we would have APCU which can be used for apps like WordPress or Drupal to get higher performance by caching data in the ram.

As PHP is used with PHP-FPM, this is a great deal for us.

It would be nice to be able to use the various Plesk PHP versions to run our webmail services. Especially PHP 7.1

Add the support for Gmagick PHP extension for Windows out of the box

It would be great if the already existing "Applications" view would recognize the PHP version that is used within that application path. That way Composer could check the correct PHP version for dependencies and simplify the general use of Composer.

It's time to add mod_php7.0 and maybe some autoinstaller for most liked modules like ioncubeloader and apcu etc...

At the moment, disablefunctions do not work per domain in Plesk for Windows because disablefunctions can be specified only in php.ini, not in .user.ini.
Plesk utilizes .user.ini for custom PHP directives only.

Please, implement support for custom disable_functions (and other functions that cannot be specified in.user.ini) on per domain basis in Plesk for Windows.

Thank you.

Currently we have the choice of fastCGI with Apache or fastCGI or FPM with nginx when setting up a PHP site.

These are great but a newer alternative is now out, PHP-PM, which could give a lot of sites a very nice performance boost.

It would be great if we could get this added as an extra option on Plesk when setting up PHP sites.

https://github.com/php-pm/php-pm

Enabling Tools & Settings > PHP Settings > Openssl does not provide a box for default config file customization. The default one is c:\usr\local\ssl\openssl.cnf.

It would be nice to have the possibility to customize this value from Plesk

Sybase module requires PHP recompilation, which is not possible in case of Plesk PHP: http://php.net/manual/en/sybase.installation.php
The only viable alternative is to install OS-provided PHP, however, it is usually severely outdated.