Comment # 18 on bug 1089061 from Andreas Stieger

Please do not re-open bug reports just to express that the resolution is not to
your liking, without also giving significant new information for
reconsideration.

(In reply to Robert Kaiser from comment #17)
> It's weird for me that openSUSE decides to drop this even though the
> official PHP docs looks like it's a core module of the PHP language. Does
> openSUSE need to be labelled "not fully compatible with PHP 7" now?

I wonder about the thinking behind this type of statements. You are free to
label openSUSE anything you like. In this case: "openSUSE Leap 15.0 does not
ship the IMAP PHP7 module due to concerns about upstream abandonment of
UW-IMAP, which generally translates in decreasing stability and lack of
security response."

A note on "core modules from http://php.net/manual/en/extensions.membership.php

* Core Extensions: These are not actual extensions. They are part of the PHP
core and cannot be left out of a PHP binary with compilation options.
* Bundled Extensions: These extensions are bundled with PHP.
* External Extensions: These extensions are bundled with PHP but in order to
compile them, external libraries will be needed.
** >>>IMAP<<<
* PECL Extensions

The imap package was dropped from SLE 15, and the php7 package source adjusted
to no longer require it. It was dropped from RHEL, too.
If you want php7-imap for openSUSE Leap 15.0 and Tumbleweed submit a change to
devel:languages:php/php7 that conditionally enables the imap build dependency
for Tumbleweed and openSUSE only. This is actually something you can
branch/build and submit yourself. I think the developers made clear the
concerns about UW-IMAP. So unless you are willing to do this and pick up the
resulting work this will remain a WONTFIX.