PHP Object-oriented construction method and its destructor method

The construction method and the destructor method are two special methods in the object, which are related to the life cycle of the object. The first method that is called automatically by an object when the object is created is constructed, which is why we use the constructor method in the object. The last method that the object is automatically called by the object when the destructor is destroyed is the reason why we use the Destructor method in the object. Therefore, the construction method is usually used to complete the initialization of some objects, using a destructor to complete some objects before the destruction of the cleanup work.
Construction Method:
① A class can have only one construction method!
The ② constructor method does not return a value.
The function of the ③ constructor is to initialize the new object, but it does not create the object, and when the construction method is created, the system will automatically call the constructor Method!

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<?php      class person{           public $name;           public $age;            //构造方法 （没有返回值，直接调用！）           public function __construct($name,$age){               //this 是一个引用对象本身，相对于当前对象的地址！               $this->age=$age;               $this->name=$name;               echo "这是一个构造方法 <br/>";           }           //构造方法2：（php4中方法）           public function person(){               echo"OK<br/>";           }       }           //两种构造方法同时存在时，优先输出方法1；           $po=new person("aaa",20);           echo $po->name.$po->age;  ?>

Destructor Method:
The main function of the destructor is to release resources! such as releasing a link to a database, or a link to a picture, or destroying an object, the main features are as follows:
The ① system is automatically called.
② is primarily used to release resources
③ the order in which destructors are called, the first created objects are destroyed first (the ones that are created first will be pushed to the stack).
④ when an object becomes a garbage object, the destructor is called immediately. Quit after the process is over! The so-called garbage object refers to the absence of a task variable to reference it again, once an object becomes a garbage object, the destructor will be called immediately!

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<?php      class person{           public $name;           public $age;            //构造方法 （没有返回值，直接调用！）           public function __construct($name,$age){               $this->age=$age;               $this->name=$name;               echo "这是一个构造方法 <br/>";           }           //析构方法           public function __destruct(){               echo $this->name."销毁资源";           }       }           //两种构造方法同时存在时，优先输出方法1；           $po=new person("aaaa",20);           $po1=new person("bbbb",20);           $po2=new person("cccc",20);  ?>

When in $po=new person ("AAAA", 20), add $po =null later;

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