PHP获取当前网址协议(HTTP/HTTPS)

if(isset($_SERVER['HTTP_X_CLIENT_SCHEME'])){
    $scheme = $_SERVER['HTTP_X_CLIENT_SCHEME'] . '://';
}elseif(isset($_SERVER['REQUEST_SCHEME'])){
    $scheme = $_SERVER['REQUEST_SCHEME'] . '://';
}else{
    $scheme = 'http://';
}

echo $scheme; // http:// or https://

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