Write a simple PHP operation prompt class_PHP tutorial

When designing some systems, it is often necessary to provide users with operational prompts. This kind of prompt is very important. Friendly prompts can improve the user's favorability of the system. There are many designs for operation tips. The following is a simple plan of mine, which is just an introduction.

Operation tips class: tips_class.php

<?php
class Tips{
	private $tips;
	static private $_instance;
	
	private function __construct($string, $url)
	{
		$this->tips = "
<meta http-equiv=refresh content=4;url=$url>
<div style='border:1px solid #B4D8F4; width:320px; height:120px; margin:0 auto; font-size:12px;'>
	<div style='background-color:#CDE6F9; height:20px;'></div>
	<div align='center' style='font-size:14px; font-weight:bold; margin:20px 0 20px 0;'>$string</div>
	<div align='center'><a href='$url'>返回</a> （4秒后自动返回）</div>
</div>
	";
		return $this->tips;
	}
	public function __toString(){
        return $this->tips;
    }
	
	private function __clone(){}
	
	public static function get_tips($string, $url)
	{
		
		if( FALSE == (self::$_instance instanceof self) )
		{
			self::$_instance = new self($string, $url);
		}
		return self::$_instance;
    }
}
?>

The function of this class is very simple, it is to jump to a certain link after 4 seconds, or click to jump to that link.

__toString() This function is very important, it can realize string output of class objects.

How to use this class?

	include_once("./tips_class.php");
	$hit = "错误：两次输入的密码不一致";
	$jump = "../login.php";
	echo $tips = Tips::get_tips($hit, $jump);

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