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<?php $array = ['key1' => 5, 'key2' => 17]; $array = array_filter($array, function ($value, $key) { return !!preg_match('/^key\d$/', $key); });
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/AR2HL:5 Stack trace: #0 [internal function]: {closure}(5) #1 /in/AR2HL(5): array_filter(Array, Object(Closure)) #2 {main} thrown in /in/AR2HL on line 5
Process exited with code 255.

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