What is the function of this keyword in php

The function of this keyword in php is to determine who to point to when instantiating. this is a pointer to the current object instance, it does not point to any other object or class. The usage of this keyword is [$this->], which means using the attributes or methods of this class within the class itself.

Function:

This is used to determine who it points to when instantiating. Therefore, this is a pointer to the current object instance and does not point to any other object or class.

Specific analysis:

$this means the specific object after instantiation! $this-> means using the attributes or methods of this class within the class itself. The ‘->’ symbol is the “infix dereference operator”.

Example:

For example, we declare a User class! It only contains one attribute $name;

<?php
class User
{
   public $_name;
}
?>

Now, we add a method to the User class. Just use the getName() method to output the value of the $name attribute!

<?php
class User
{
      public $name;
      function getName()
      {
             echo $this->name;
      }
}
$user1 = new User();
$user1->name = &#39;张三&#39;;
$user1->getName();        //这里就会输出张三！
$user2 = new User();
$user2->name = &#39;李四&#39;;  
$user2->getName();       //这里会输出李四！
?>

Two User objects are created above. They are $user1 and $user2 respectively.

When calling $user1->getName(). The code in the User class above echo $this->name; is equivalent to echo $user1->name;

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