function is_mobile () { if ( empty ( $_SERVER [ 'HTTP_USER_AGENT' ]) ) { $is_mobile = false ; } elseif ( strpos( $_SERVER [ 'HTTP_USER_AGENT' ] , 'Mobile' ) !== false // many mobile devices (all iPhone, iPad, etc.) || strpos( $_SERVER [ 'HTTP_USER_AGENT' ] , 'Android' ) !== false || strpos( $_SERVER [ 'HTTP_USER_AGENT' ] , 'Silk/' ) !== false || strpos( $_SERVER [ 'HTTP_USER_AGENT' ] , 'Kindle' ) !== false || strpos( $_SERVER [ 'HTTP_USER_AGENT' ] , 'BlackBerry' ) !== false || strpos( $_SERVER [ 'HTTP_USER_AGENT' ] , 'Opera Mini' ) !== false || strpos( $_SERVER [ 'HTTP_USER_AGENT' ] , 'Opera Mobi' ) !== false ) { $is_mobile = true ; } else { $is_mobile = false ; } return $is_mobile ; }