使用 array_reduce 自定义配置文件

<?php
return [
    "middlewares" => [
        "before" => [
            "app\Http\Middleware\BeforeMiddleware",
            "app\Http\Middleware\NextMiddleware"
        ],
        "after" => [
            "app\Http\Middleware\AfterMiddleware"
        ]
    ]
];

<?php
if (!function_exists("config")) {
    function config($key)
    {
        $key_arr = explode(".", $key);
        $arr = include ROOT_DIR . "/config/" . $key_arr[0] . ".php";
        array_shift($key_arr);
        return array_reduce($key_arr, function ($arr, $key) {
            return $arr[$key];
        }, $arr);
    }
}

<?php
$arr = [1,2,3,4,5];
array_reduce($arr,function($x,$y){
    return $x + $y;
});