multiple T_OBJECT_OPERATOR in php

Question

我是一个初学者，在理解php中的->语法时遇到麻烦，我知道它用于访问类中的对象，但是如果我输入多个->是什么意思，例如：

$this -> $var1 -> var2 -> var3

Answer 1

It's the same as accessing nested arrays using this:

$arr['key1']['key2']['key3']

(I hope this analogy is helpful to you.)

$this->var1->var2->var3

Here $this is an object which has a property var1 . var1 is also an object itself which has a property var2 . var2 is also an object itself which has a property var3 . It could be constructed as such:

$this->var1 = new stdClass;
$this->var1->var2 = new stdClass;
$this->var1->var2->var3 = new stdClass;