PHP header() function

This function is used to redirect a page to a different url, to set the content type and to tell a browser to not cache the web page.

Syntax

header(string $header, bool $replace, int $http_response_code);

The string $header is the header string, $replace indicates whether the header replace a previous similar header, $http_response_code is a special value, that shows whether the response is successful or not.

Redirect Url

Example

<?php
    header('Location: http://www.example.com');
?>

Set Content Type

Example

<?php
    header('Content-Type: text/css'); 
    header('Content-Type: text/javascript');
    header('Content-Type: text/plain');
    header('Content-Type: text/xml');
?>

Set no cache to page

Example

<?php
    header("Pragma: no-cache");
?>