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<?php $a = array('a' => 'abc'); array_filter($a, function($k,$v) { var_dump($k,$v); });
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/1Efh5:4 Stack trace: #0 [internal function]: {closure}('abc') #1 /in/1Efh5(4): array_filter(Array, Object(Closure)) #2 {main} thrown in /in/1Efh5 on line 4
Process exited with code 255.

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