PHP Function to check Android version from the user agent.

is-old-android.php

/**
 * Is Old Android
 *
 * Check to see it the user agent is Android and if so then
 * check the version number to see if it is lower than 4.0.0
 * or passed parameter
 *
 * @param  string $version
 * @return boolean
 */
function is_old_android($version = '4.0.0'){

	if(strstr($_SERVER['HTTP_USER_AGENT'], 'Android')){
		
		preg_match('/Android (\d+(?:\.\d+)+)[;)]/', $_SERVER['HTTP_USER_AGENT'], $matches);

		return version_compare($matches[1], $version, '<=');

	}

}

// usage
if(is_old_android()) echo ':( I am an old robot, qzzzzt';

// or to check before any version
if(is_old_android('2.3.0')) echo ':( I am an even older robot, qzzzzt';

// Pass that to your js in your template header
<script type="text/javascript">
    var old_android = <?php echo (is_old_android()) ? 'true' : 'false'; ?>

    // Access it through the window global
    console.log(window.old_android);
</script>

Hi,
In my case $_SERVER['HTTP_USER_AGENT'] is like this Apache-HttpClient/UNAVAILABLE (java 1.4)
Correct user agent is not being set. Not being detected Android.

This is quite the handy little tidbit. Thanks!