Detect Mobile Devices in PHP

These days, everyone wants to make their website responsive. But what if your website is too old, or you want to make a different versions of same website for different devices. This demand for separate websites is increased day by day, so that they can be open well on both mobile and desktop.

For this, there is requirement to redirect the appropriate version of website on user device. The mobile version of the website should be open on the mobile device and desktop version should be open on desktop device.

HTTP_USER_AGENT

HTTP_USER_AGENT is a string denoting the user agent being which 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 -

$_SERVER['HTTP_USER_AGENT']

$_SERVER is a PHP super global variable which holds information about headers, paths, and script locations.

In the given script, 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');
}
?>

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