What does $this mean in php

In PHP, "$this" means "current object". It is a pointer to the current object instance. It is used in conjunction with the connector "->" and is specially used to complete the internal members of the object. Access between; syntax "$this -> member attribute;" or "$this -> member method (parameter list);".

The operating environment of this tutorial: Windows 7 system, PHP version 7.1, DELL G3 computer

$this means after instantiation The specific object is the current object; $this is a pointer to the current object instance and does not point to any other object or class.

In PHP object-oriented programming, once an object is created, there will be a special object reference "$this" in each member method of the object. Which object the member method belongs to, "$this" represents which object, and is used in conjunction with the connector -> to complete access to internal members of the object. As shown below:

$this -> 成员属性;
$this -> 成员方法(参数列表);

For example, there is a $name attribute in the Website class. We can use the following method in the class to access the $name member attribute:

$this -> name;

It should be noted that when using $this to access a member attribute, it only needs to be followed by the name of the attribute, and the $ symbol is not required. In addition, $this can only be used in objects, $this cannot be used elsewhere, and things that do not belong to objects $this cannot be called, so to speak. Without an object, there is no $this.

[Example] Use $this to call properties and methods in a class.

<?php
header("Content-type:text/html;charset=utf-8");
class Website {
	public $name;
	public function __construct($name) {
		$this -> name = $name;
		$this -> name();
	}

	public function name() {
		echo $this -> name . &#39;<br>&#39;;
		$this -> url();
	}

	public function url() {
		echo &#39;https://www.php.cn/<br>&#39;;
		$this -> title();
	}

	public function title() {
		echo &#39;PHP入门教程<br>&#39;;
	}

}

$object = new Website(&#39;PHP中文网&#39;);
?>

Output results:

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