“->”(减号、右尖括号):用于类中,访问类里的函数或对象,比如如下代码:
"=>"(等号、右尖括号):数组中给值赋值,比如如下代码:
$arr=array("one" =>("1"=>10, "2"=>20), "two"=>2);
那么$arr["one"]["1"]=10;
‘->’与C++类似，用以指向对象内部结构或方法；
‘=>’是PHP数组带索引元素定义的一种方式。
=> 键值对,左边是键,右边是值（类似 json 的 key:val ）
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