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<?php var_dump(array_filter(['foo'=>'bar','baz'=>'quix'],function($a,$b){ var_dump("$a => $b"); }, 2));
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/Gafu3:2 Stack trace: #0 [internal function]: {closure}('foo') #1 /in/Gafu3(2): array_filter(Array, Object(Closure), 2) #2 {main} thrown in /in/Gafu3 on line 2
Process exited with code 255.

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