php - header location redirect: https to https, http to http

问题

How do I properly use header function, so

header("location: http://".$_SERVER['HTTP_HOST']."/?para=abc"); //for http

and

header("location: https://".$_SERVER['HTTP_HOST']."/?para=abc"); //for https

could be written in 1 string if possible?

.htaccess file will take care of all http pages to be redirected to https with no problem, but I believe it makes sense to use a proper syntax for http/https pages in header("location:...), so it is correct for all browsers.

回答1:

$protocol='http';
if (isset($_SERVER['HTTPS']))
  if (strtoupper($_SERVER['HTTPS'])=='ON')
    $protocol='https';

header("location: $protocol://".$_SERVER['HTTP_HOST']."/?para=abc");

回答2:

You could also use the following code:

header("Location: //www.google.com");

回答3:

if (isset($_SERVER['HTTPS']) && $_SERVER['HTTPS'] != '') {
    header("location: https://".$_SERVER['HTTP_HOST']."/?para=abc");
} else {
    header("location: http://".$_SERVER['HTTP_HOST']."/?para=abc")
}

This should work for Apache, at least.

回答4:

You can isolate the protocol-type by doing something like this:

$protocol = isset($_SERVER['HTTPS']) and 'https' or 'http'

Then

header("location: $protocol://".$_SERVER['HTTP_HOST']."/?para=abc");

回答5:

You can get the protocol by following code:

$protocol = strtolower( substr( $_SERVER[ 'SERVER_PROTOCOL' ], 0, 5 ) ) == 'https' ? 'https' : 'http';

and then redirect like this

header( 'location: ' . $protocol . '://' . $_SERVER[ 'HTTP_HOST' ] . '/?para=abc' );

来源：https://stackoverflow.com/questions/8801340/php-header-location-redirect-https-to-https-http-to-http

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