Fix GH-8841: php-cli core dump calling a badly formed function #10989
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It's actually not php-cli specific, nor SAPI specific. We should delay the registration of the function into the function table until after the compilation was successful, otherwise the function is mistakingly registered and a NULL dereference will happen when trying to call it.
I based my test of Nikita's test, so credits to him for the test: #8933 (comment)
EDIT: I thought I was making a PR against my own fork, to already let it go through CI on my fork. But apparantly the "create PR" shortcut button creates the PR against upstream, hence the change in title 😅