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Detailed explanation of the usage and precautions of header function in PHP, detailed explanation of phpheader function_PHP tutorial
- WBOYOriginal
- 2016-07-12 08:49:35845browse
Detailed explanation of the usage and precautions of header function in PHP, detailed explanation of phpheader function
void header ( string $string [, bool $replace = true [, int $http_response_code ]] ) : Send a raw HTTP header
Here are some ways to use headers:
1. Use the header function to jump to the page;
header('Location:'.$url);
Where $url is the URL to be redirected.
The following points should be noted when using this method:
•There cannot be a space between Location and ":", otherwise an error will occur (Note: I just tested it. In my local environment, 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);
•What follows the header will still be executed;
2. Use header to declare content-type
header('content-type:text/html;charset=utf-8');
There’s nothing to say about this;
3. Use header to return response status code
header(sprintf('%s %d %s', $http_version, $status_code, $description));
The style is like this;
For example: header('HTTP/1.1 404 Not Found');
4. Use header to perform jump after a certain time
header("Refresh: {$delay}; url={$url}");
Where $delay is the time to delay the jump, $url is the url that needs to be jumped
For example: header('Refresh: 10; url=http://www.example.org/'); means to jump to the website http://www.eexample.org after 10 seconds
5. Use header to control browser cache
header("Expires: Mon, 26 Jul 1997 05:00:00 GMT");
header("Last-Modified: " . gmdate("D, d M Y H:i:s") . "GMT");
header("Cache-Control: no-cache, must-revalidate");
header("Pragma: no-cache");
6. Perform http verification
header('HTTP/1.1 401 Unauthorized');
header('WWW-Authenticate: Basic realm="Top Secret"');
7. Use header to download
header('Content-Type: application/octet-stream');//设置内容类型
header('Content-Disposition: attachment; filename="example.zip"'); //设置MIME用户作为附件下载 如果将attachment换成inline意思为在线打开
header('Content-Transfer-Encoding: binary');//设置传输方式
header('Content-Length: '.filesize('example.zip'));//设置内容长度
// load the file to send:
readfile('example.zip');//读取需要下载的文件
The following will introduce you to several uses of PHP header
Jump page
header('Location:'.$url); //No space between Location and ":".
Declare content-type
header('content-type:text/html;charset=utf-8');
Return response status code
header('HTTP/1.1 404 Not Found');
Execute jump after a certain time
header('Refresh: 10; url=http://www.baidu.com/'); //Jump after 10s.
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");
Perform http verification
header('HTTP/1.1 401 Unauthorized');
header('WWW-Authenticate: Basic realm="Top Secret"');
Perform download operation
header('Content-Type: application/octet-stream'); //Set the content type
header('Content-Disposition: attachment; filename="example.zip"'); //Set MIME user as attachment
header('Content-Transfer-Encoding: binary'); //Set the transmission method
header('Content-Length: '.filesize('example.zip')); //Set content length