WordPress 判断不同的浏览器代码

<?php global $is_IE; if ($is_IE) { echo '您正在使用不安全的 IE 浏览器，请使用现代浏览器，浏览本站，以获得最佳体验！'; }> 

 $is_iphone (boolean) iPhone Safari
$is_chrome (boolean) Google Chrome
$is_safari (boolean) Safari
$is_NS4 (boolean) Netscape 4
$is_opera (boolean) Opera
$is_macIE (boolean) Mac Internet Explorer
$is_winIE (boolean) Windows Internet Explorer
$is_gecko (boolean) FireFox
$is_lynx (boolean)
$is_IE (boolean) Internet Explorer
$is_edge (boolean) Microsoft Edge