I suggest to deprecate png2wbmp() and jpeg2wbmp() as of PHP 7.2 and to
remove the functions as of PHP 8.0.
Both functions are very special for ext/gd; there are no other direct
conversion functions, and even their names do not start with "image"
like all other ext/gd functions, except gd_info(). Implementing a
fallback in userland would be trivial (besides an issue with
image2wbmp(), see <https://bugs.php.net/bug.php?id=73317>).
Furthermore, WBMP supposedly isn't really important nowadays.
The benefit would be less code and documentation to maintain, and a
Christoph M. Becker
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