What does the Request $request mean by writing this?

Public Function User (Request $request) {}

Reply content:

Public Function User (Request $request) {}

http://php.net/manual/zh/language.oop5.typehinting.php

PHP 5 can use type constraints.
The parameters of the function can specify that the object must be (the name of the class specified in the function prototype), interface, Array (PHP 5.1), or callable (PHP 5.4).

Official examples

    /**     * 测试函数     * 第一个参数必须为 OtherClass 类的一个对象     */    public function test(OtherClass $otherclass) {        echo $otherclass->var;    }

Request is a class, $request is the object it generates! Of course, it could be an interface or something!

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