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    <p>Have my user agent code:</p> <pre><code>&lt;?php /* USER-AGENTS ================================================== */ function check_user_agent ( $type = NULL ) { $user_agent = strtolower ( $_SERVER['HTTP_USER_AGENT'] ); if ( $type == 'bot' ) { // matches popular bots if ( preg_match ( "/googlebot|adsbot|yahooseeker|yahoobot|msnbot|watchmouse|pingdom\.com|feedfetcher-google/", $user_agent ) ) { return true; // watchmouse|pingdom\.com are "uptime services" } } else if ( $type == 'browser' ) { // matches core browser types if ( preg_match ( "/mozilla\/|opera\//", $user_agent ) ) { return true; } } else if ( $type == 'mobile' ) { // matches popular mobile devices that have small screens and/or touch inputs // mobile devices have regional trends; some of these will have varying popularity in Europe, Asia, and America // detailed demographics are unknown, and South America, the Pacific Islands, and Africa trends might not be represented, here if ( preg_match ( "/phone|iphone|itouch|ipod|symbian|android|htc_|htc-|palmos|blackberry|opera mini|iemobile|windows ce|nokia|fennec|hiptop|kindle|mot |mot-|webos\/|samsung|sonyericsson|^sie-|nintendo/", $user_agent ) ) { // these are the most common return true; } else if ( preg_match ( "/mobile|pda;|avantgo|eudoraweb|minimo|netfront|brew|teleca|lg;|lge |wap;| wap /", $user_agent ) ) { // these are less common, and might not be worth checking return true; } } return false; } ?&gt; </code></pre> <p>How to use:</p> <pre><code>&lt;?php $ismobile = check_user_agent('mobile'); if($ismobile) { return 'yes'; } else { return 'no'; } ?&gt; </code></pre>
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