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<?php $a = [1=>'a', 2=>'b']; var_dump(array_map(function($k, $v) { return ['val' => $v, 'label' => $k]; }, $a));
Output for git.master, git.master_jit, rfc.property-hooks
Fatal error: Uncaught ArgumentCountError: Too few arguments to function {closure}(), 1 passed and exactly 2 expected in /in/s4FWI:5 Stack trace: #0 [internal function]: {closure}('a') #1 /in/s4FWI(5): array_map(Object(Closure), Array) #2 {main} thrown in /in/s4FWI on line 5
Process exited with code 255.

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