什么是“返回$ container-＆gt; {$ resource};”意思

Question

括号是什么意思以及在何处阅读更多

return $container->{$resource};

Answer 1

括号是利用变量变量。它可以更容易区分：

// gets the value of the "resource" member from the container object
$container->resource;

和

// gets the value of the "foo" member from the container object
$resource = 'foo';
$container->$resource;

您可以在此处阅读更多内容：http://php.net/manual/en/language.variables.variable.php

Answer 2

两种可能性：

1. variable variable

   $ resource =“得分”; //动态设置名称

   返回$ container-＆gt; {$ resource}; //与return $ container-＆gt;得分相同;

2. 错字/初学者错误

程序员打算输入：

return $container->resource;  // returns resource public member variable