Analysis of the existence form of php objects in memory, memory form of php objects_PHP tutorial

Analysis of the existence form of php objects in memory, memory form of php objects

The example of this article analyzes the existence form of PHP objects in memory. Share it with everyone for your reference. The specific analysis is as follows:

<&#63;php
class Person{
 public $name;
 public $age;
}
$p1 = new Person();
$p1->name = "小明";
$p1->age=80;
$p2=$p1;
$p2->age=85;
echo $p2->name;
echo $p1->age;
&#63;>

(1) $p1 corresponds to the memory address, assuming it is 0x123, ($p1 and the address are stored in the stack area, which is equivalent to the index when we look up the dictionary);
(2) Find the heap area through the index of the memory address. The heap area stores data such as "Xiao Wang" and "80"
(3) $p2 = $p1, in fact, the memory address 0x123 of $p1 is passed to $p2. The attributes $name and $age in the heap area remain unchanged, that is, they will not be copied again. Therefore, when changing $p2->age=85, the value of $p1->age also changes.

I hope this article will be helpful to everyone’s PHP programming design.