laravel中间件的实现原理

中间件的实现原理

运用 array_reduce 以及 call_user_func 实现

interface Middleware
{
public static function handle(Closure $next);
}class VerfiyCsrfToekn implements Milldeware{   
public static function handle(Closure $next)    {       
echo '验证csrf Token <br>';       
$next();   
}
}class VerfiyAuth implements Milldeware{
public static function handle(Closure $next)    {       
echo '验证是否登录 <br>';       
$next();   
}
}class SetCookie implements Milldeware{   
public static function handle(Closure $next)    {       
$next();       
echo '设置cookie信息！';   
}
}$handle = function () {   
echo '当前要执行的程序!';
};$pipe_arr = [ 'VerfiyCsrfToekn', 'VerfiyAuth', 'SetCookie', ];$callback = array_reduce($pipe_arr, function ($stack, $pipe) {
return function () use ($stack, $pipe) {
return $pipe::handle($stack);
};
}, $handle);call_user_func($callback);