How to use header() function to refresh the page in PHP?

In PHP we can use the header() function to refresh the page; this function will send the HTTP header to the client or browser in its original form. The following article will introduce to you how to use the header() function to refresh the page. I hope it will be helpful to you.

PHP header() function

PHP header() function converts the HTTP header in its original form Sent to client or browser. Raw data is sent as header information with requests made by the server (especially HTTP requests) before sending HTML, XML, JSON or other output to the browser or client. HTTP headers more accurately provide the information needed about the objects sent in the message bodies of requests and responses.

Basic syntax

header( $header, $replace = TRUE, $http_response_code )

or

header(string, replace, http_response_code)

Parameters:

● $header: It contains the header string. There are two types of header calls. The first case of the header starts with the string "http/" and is used to determine the HTTP status code to be sent. The second case of headers starts with "Location:". This is a mandatory parameter.

●$replace: This is an optional parameter and can be omitted. It is used to indicate that a header should replace the previous one or add a second header; the default value is True (will replace). If the $replace value is False, multiple headers of the same type are forced to be used.

●$http_response_code: This is an optional parameter and can be omitted. It forces the HTTP response code to a specified value (php 4.3 and above).

Note: This header() function prevents multiple headers from being sent at the same time. Following the release of PHP 4.4, this is protection against header injection attacks.

Code example

The following is an example of how to use the header() function to refresh the page in PHP:

Example 1: Use the header() function to refresh the web page every 3 seconds.

"; 
    
// 该函数每3秒钟刷新一次页面
header("refresh: 3"); 
    
echo date('H:i:s Y-m-d'); 
  
exit; 
?>

Output:

Example 2: Use the header() function to redirect the web page to another page after 3 seconds Jump to another page

"; 
    
// 该函数每3秒钟刷新一次页面
header("refresh: 3; url = http://www.php.cn/"); 
exit; 
?>

Output:

Related video tutorial recommendation: "PHP Tutorial"

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