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<?php $arr = array(); $arr["a"] = "A"; $arr["b"] = "B"; $str = array_filter($arr, function($e1, $e2){ echo $e1." :: ".$e2."<br>"; return $e1; }); var_dump($str);
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/iCRqh:6 Stack trace: #0 [internal function]: {closure}('A') #1 /in/iCRqh(6): array_filter(Array, Object(Closure)) #2 {main} thrown in /in/iCRqh on line 6
Process exited with code 255.

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