How to detect a mobile device using PHP?

HTTP_USER_AGENT

HTTP_USER_AGENT is a string denoting the user agent that is accessing the page. The website includes a user agent field in its header while connecting to a browser. By using HTTP_USER_AGENT, we can easily detect the device name.

Syntax of HTTP_USER_AGENT

$_SERVER['HTTP_USER_AGENT']

Here, $_SERVER is a special reserved PHP super global variable that holds all web server information about headers, paths, and script locations. These special variables were introduced in PHP 4.1.0.

In the given code snippet, we can easily detect the device name on which our website is opened.

<?php
$iphone = strpos($_SERVER['HTTP_USER_AGENT'],"iPhone");
$android = strpos($_SERVER['HTTP_USER_AGENT'],"Android");
$webos = strpos($_SERVER['HTTP_USER_AGENT'],"webOS");
$blkberry = strpos($_SERVER['HTTP_USER_AGENT'],"BlackBerry");
$ipod = strpos($_SERVER['HTTP_USER_AGENT'],"iPod");

if ($iphone || $android || $webos || $ipod || $blkberry == true)
{
   header('Location: example.com');
}
else {
   header('Location:etutorialspoint.com');
}
?>