What is the role of destructor in php

The function of the destructor in php is to release memory. The destructor will be called when the object is destroyed. The syntax format for defining a destructor is: [__destruct()]. PHP uses a garbage collection mechanism to automatically clear objects that are no longer used. Even if the unset function is not used, the destructor will be automatically called.

Function:

The destructor is called when the object is destroyed, and its function is to release the memory.

The format of defining the destructor is:

__destruct()

Example:

class Preson{
public $name;    //定义变量
public $age;
public $sex;
public $height;
function __construct($name,$age,$sex,$height){
$this->name = $name;         //为变量赋值
$this->age = $age;
$this->sex = $sex;
$this->height = $height;
}
function __destruct(){
echo "对象被销毁了";
}
}
$Preson1 = new Preson("大白","20","女","180");
echo $Preson1->name;

The result of the operation is:

大白对象被销毁了

After the operation is completed, the object is destroyed .

Note:

php uses a "garbage collection" mechanism to automatically clear objects that are no longer used and release memory. That is to say, even if the unset function is not used, the destructor method will automatically called.

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