Some usages of PHP header function

PHP header function is a function that every programmer will use frequently. Earlier we introduced some tutorials on the usage of PHP header function. Now this article will introduce some usage of PHP header function.

void header ( string $string [, bool $replace = true [, int $http_response_code ]] ) : Send a raw HTTP header

Here are some ways to use header:
1. Use the header function to jump to the page;
Header('Location:'.$url);
Wherein $url This is the url that will be redirected.
Precautions for this usage include the following:

There cannot be a space between Location and ":", otherwise an error will occur (Note: I just tested it, in my local environment Next, there is no page jump, but no error is reported, I don’t know the reason);

There cannot be any output before using the header (Note: Everyone knows this, if there is any output before the header , including blanks, the error "header already sent by xxx" will appear);

The things after the header will still be executed;

2. Use header to declare content-type
　header( 'content-type:text/html;charset=utf-8');
There is nothing to say about this;
3. Use header to return response status code
Header(sprintf('%s %d % s', $http_version, $status_code, $description));
The style is like this;
For example: header('HTTP/1.1 404 Not Found');
4. Use header at a certain time Then execute the jump
Header("Refresh: {$delay}; url={$url}");
Where $delay is the time to delay the jump, and $url is the url that needs to be jumped
For example: header('Refresh: 10; url=http://www.example.org/'); means jumping to http://www.eexample.org after 10 seconds
5. Use header control Browser cache
header("Expires: Mon, 26 Jul 1997 05:00:00 GMT");
header("Last-Modified: " . gmdate("D, d M Y H:i:s") . "GMT");
header("Cache-Control: no-cache, must-revalidate");
header("Pragma: no-cache");
6. Perform http verification
Header('HTTP/1.1 401 Unauthorized');
header('WWW-Authenticate: Basic realm="Top Secret"');
7. Use header for download operation
header('Content- Type: application/octet-stream');//Set the content type
Header('Content-Disposition: attachment; filename="example.zip"'); //Set the MIME user to download as an attachment. If you replace attachment with inline means opening online
Header('Content-Transfer-Encoding: binary');//Set the transmission method
Header('Content-Length: '.filesize('example.zip'));// Set the content length
// load the file to send:
readfile('example.zip');//Read the file that needs to be downloaded

The above seven points are some common PHP header Usage, we also introduced some articles about PHPheader earlier, you can refer to them, I hope it will be helpful to you.

Related recommendations:

Recommended articles about the php headers_sent() function

Explanation on how to use the PHP header function

Summary of several issues to pay attention to when using PHP Header for page jump

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