As the business becomes more and more complex, a script will need to include or require more and more class files,
At this time, you need to use the __autoload() method to automatically load the class file when instantiating the object
1, the use of __antoload()
Create a new init.php file with the following code:
<?php
/**
* Created by PhpStorm.
* User: Administrator
* Date: 2018/3/3 0003
* Time: 下午 3:39
*/
header('content-type:text/html;charset=utf8');
function __autoload($className){
//自动加载类名为className,文件名为./$className.class.php的文件
require "./$className.class.php";
}2, test
Create new student class and teacher class
Student.class.php code is as follows:
<?php
/**
* Created by PhpStorm.
* User: Administrator
* Date: 2018/3/3 0003
* Time: 下午 3:41
*/
class Student{
public function __construct()
{
echo "学生类已加载";
}
}Teacher.class.php code is as follows:
<?php
/**
* Created by PhpStorm.
* User: Administrator
* Date: 2018/3/3 0003
* Time: 下午 3:41
*/
class Teacher{
public function __construct()
{
echo "老师类已加载";
}
}Create the index.php file to test whether the corresponding class file needs to be introduced at the same time to load the corresponding constructor
The code is as follows:
<?php /** * Created by PhpStorm. * User: Administrator * Date: 2018/3/3 0003 * Time: 下午 3:43 */ require './init.php'; $student=new Student(); echo "<br>"; $teacher=new Teacher();
The effect of running the index.php file in the browser is as follows:
