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<?php function not($f) { return function () use ($f) { return !call_user_func_array($f, func_get_args()); }; } var_dump(array_filter([null, 0, 1, 2], not("is_null")));
Output for git.master, git.master_jit, rfc.property-hooks
array(3) { [1]=> int(0) [2]=> int(1) [3]=> int(2) }

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