我们在使用thinkphp开发的时候，有时候会用到getById('1')这个方法快速的获取一条信息的内容，这个方法比用where(" id =1 ")->find()好用多了，同时查询效率也比find快速。
很多人在刚开始接触这个方法的时候，没有多留意它的内部实现机制，仅仅认为是通过id来获取信息，而事实并非如此。
例如有的系统里存在getByTitle("nihao")、getByMoney('1000')这类方法，这些与刚才提到的getById('1')很相似，同时实现的功能原理也与getById('1')一样。
其实类似这种getById($id)、getByTitle($title)、getByUserName($username)等等,以“getBy+字段”的方法有个专有名词叫做“魔术方法”，它后面的字段可以是数据表中的任何一个字段，返回结果只能是查询出来的第一条数据，这种方法查询的效率很高，很好记住。
有时候我们的字段不是连起来的，例如：user_name 这样子的字段，我们是不是这样子写（getByUser_name($name)）呢？答案是否定的，thinkphp中不支持这样子的方法，我们需要使用驼峰法来命名，应该写成这样 getByUserName($name)就可以了！
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DVWA
Damn Vulnerable Web App (DVWA) is a PHP/MySQL web application that is very vulnerable. Its main goals are to be an aid for security professionals to test their skills and tools in a legal environment, to help web developers better understand the process of securing web applications, and to help teachers/students teach/learn in a classroom environment Web application security. The goal of DVWA is to practice some of the most common web vulnerabilities through a simple and straightforward interface, with varying degrees of difficulty. Please note that this software
