MySQL-我的代码中解析错误(语法错误) [英] Mysql - Parse error (syntax error) in my code

问题描述

当我使用时:

$mysqli = new mysqli('localhost', 'root', '', 'cms');

在我的课堂上，结果显示错误:

in my class, As a result display Error:

Parse error: syntax error, unexpected '$mysqli' (T_VARIABLE), expecting function (T_FUNCTION) in D:\xamppp\htdocs\cms\includes\td-class-db.php on line 12

当使用$mysqli = new mysqli('localhost', 'root', '', 'cms');超出类时，不会显示任何错误！

And when use $mysqli = new mysqli('localhost', 'root', '', 'cms'); outsilde the class no display any error!

我的课:

class Connect_db{
  $mysqli = new mysqli('localhost', 'root', '', 'cms');
}

为什么?

推荐答案

在类中创建成员变量时无法实例化类.您必须在构造函数或方法中执行此操作:

You can't instantiate classes when creating member variables in a class. You have to do this in the constructor or a method:

class Connect_db{
    private $mysqli;

    public function __constructor() {
        $this->mysqli = new mysqli('localhost', 'root', '', 'cms');
    }
}

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