检测user-agent

/**
 * 判断是否为手机端
 * @return bool
 */
function isMobile(){
    $useragent = strtolower($_SERVER['HTTP_USER_AGENT']);
    if (preg_match("/iphone|ios|android|mini|mobile|mobi|Nokia|Symbian|iPod|iPad|Windows\s+Phone|MQQBrowser|wp7|wp8|UCBrowser7|UCWEB|360\s+Aphone\s+Browser|AppleWebKit/", $useragent)) {
        return true;
    } else {
        return false;
    }
}