1.11 destructor
1.11.1 Introduction
When the object is destroyed automatically call
grammar
function __destruct(){
}
Foot care: destructor parameters can not
example
<?php
class Student {
private $name;
//构造方法
public function __construct($name) {
$this->name=$name;
echo "{$name}出生了<br>";
}
//析构方法
public function __destruct() {
echo "{$this->name}销毁了<br>";
}
}
//测试
$stu1=new Student('tom');
$stu2=new Student('berry');
$stu3=new Student('ketty');
echo '<hr>';
operation result
1.11.2 Computer Memory Management
Computer Memory management: FIFO, last-out
FIFO memory management is generally used in the business logic, such as spike, tickets, etc.
Last out is the default memory management computer
1.11.3 Questions
Questions 1
<?php
class Student {
private $name;
//构造方法
public function __construct($name) {
$this->name=$name;
echo "{$name}出生了<br>";
}
//析构方法
public function __destruct() {
echo "{$this->name}销毁了<br>";
}
}
//测试
$stu1=new Student('tom');
$stu2=new Student('berry');
$stu3=new Student('ketty');
unset($stu2);
echo '<hr>';
/*
tom出生了
berry出生了
ketty出生了
berry销毁了
ketty销毁了
tom销毁了
*/
Questions 2
<?php
class Student {
private $name;
//构造方法
public function __construct($name) {
$this->name=$name;
echo "{$name}出生了<br>";
}
//析构方法
public function __destruct() {
echo "{$this->name}销毁了<br>";
}
}
//测试
new Student('tom');
new Student('berry');
new Student('ketty');
/*
tom出生了
tom销毁了
berry出生了
berry销毁了
ketty出生了
ketty销毁了
*/
Questions 3
<?php
class Student {
private $name;
//构造方法
public function __construct($name) {
$this->name=$name;
echo "{$name}出生了<br>";
}
//析构方法
public function __destruct() {
echo "{$this->name}销毁了<br>";
}
}
//测试
$stu=new Student('tom');
$stu=new Student('berry');
$stu=new Student('ketty');
/*
tom出生了
berry出生了
tom销毁了
ketty出生了
berry销毁了
ketty销毁了
*/
