<? echo $_SERVER['SERVER_NAME']; // 通常返回域名，不可靠
echo $_SERVER['HTTP_HOST']; // 获取域名，比较可靠
$slhttp = ((isset($_SERVER['HTTPS']) && $_SERVER['HTTPS'] == 'on') || (isset($_SERVER['HTTP_X_FORWARDED_PROTO']) && $_SERVER['HTTP_X_FORWARDED_PROTO'] == 'https')) ? 'https://' : 'http://';
echo $slhttp;// 获取协议
echo ((isset($_SERVER['HTTPS']) && $_SERVER['HTTPS'] == 'on') || (isset($_SERVER['HTTP_X_FORWARDED_PROTO']) && $_SERVER['HTTP_X_FORWARDED_PROTO'] == 'https')) ? 'https://' : 'http://'.$_SERVER['SERVER_NAME'];
?>
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