Shouldn't this page at least mention Composer? Having Composer installed seems to be a requirement for running update.php in MediaWiki now.
Topic on Manual talk:Installing MediaWiki
I added mention of Composer and try to organize the info for developers a bit better.
Shouldn't this page mention, which external dependencies are needed to be installed or at least link to somewhere, where it's written. I'm struggeling with this right now!
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