Development ideas and case analysis of PHP object-oriented programming

In the process of learning PHP, object-oriented is an indispensable part. Many friends are ambiguous about object-oriented. To learn object-oriented, of course, we must first understand what a class is, what an object is, and what a class is. What does it have to do with the object? The relationship between classes and objects: A class is a template used to generate objects, and an object is an instance of a class. I believe everyone is familiar with this. Today we will introduce to you the development of PHP object-oriented programming!

The first step is to download the PHP object-oriented programming class library we need to use in this course: http://www.php.cn/xiazai/leiku/618

Step 2: After the download is completed, find the php class file we need, unzip it to our local directory, and create a new php file!

The third step, after completion, we need to call this class in the new php file and instantiate the class:

<?php
include_once "dingyi3.php";//引入类文件
//实例化
$person1 = new Person ();
$person2 = new Person ( "2" );
$person3 = new Person ( "3" );
// 自动调用了__set()
$person1->name = "张三";
echo $person1->name;
echo "<br/>";
echo $person1->say ();
// 自动调用了__get()
echo $person1->age;
echo "<br/>";
var_dump ( isset ( $person1->name ) );
echo "<br/>";
unset($person1->name);
echo "unset------------>".$person1->name;//name 没有被unset()
echo "<br/>";
$person2 = null;
?>

Run the file, and the result will be as shown below:

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