Function detect mobile device

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function mobile_user_agent_switch(){
$device = '';
if( stristr($_SERVER['HTTP_USER_AGENT'],'ipad') ) {
$device = "ipad";
} else if( stristr($_SERVER['HTTP_USER_AGENT'],'iphone') || strstr($_SERVER['HTTP_USER_AGENT'],'iphone') ) {
$device = "iphone";
} else if( stristr($_SERVER['HTTP_USER_AGENT'],'blackberry') ) {
$device = "blackberry";
} else if( stristr($_SERVER['HTTP_USER_AGENT'],'android') ) {
$device = "android";
}

if( $device ) {
return $device;
} else {
return false;
}
}