Summary of header usage in PHP, Phpheader usage Summary _php Tutorial

Summary of header usage in PHP, summary of Phpheader usage

This article summarizes the usage of headers in PHP. Share to everyone for your reference, as follows:

The function of the header () function in PHP is to send header information to the client.

What is header information?

Here is a simple explanation, detailed self-view HTTP protocol.

In the HTTP protocol, the server-side answer (response) content consists of two parts: header information and body content, where the header information is not part of the HTML, and the body content is not </body>. The header information is invisible to the user and contains many items, including: Server information, date, length of content, etc. The body content is the entire HTML, which is all you can see.

What is the use of the header information?

The function of the head information is many, the main one has the following several:

1. Jump:

Header ("REFRESH:2; Url=http://localhost//session.php ");//2 seconds after the jump

If the wait time is 0, it is equivalent to the header ("Location:").

Header ("location:http://localhost//session.php");//Direct jump

2, the content of the specified page:

The same XML file, if specified in the header information: Content-type:application/xml, the browser will parse it according to the XML file format. However, if the header message is: Content-type:text/xml, the browser will treat it as a text parsing. (The browser does not parse the file by extension)

3, Accessories Download:

$filename = "Tupian.jpg"; The file path can be either an absolute path or a relative path header (' content-type:application/x-jpg '); The type of the file header (' content-disposition:attachment; Filename= ' is saved with the filename. jpg "'); Download the displayed name ReadFile ("$filename"); exit ();

View:

$link = "Tupian.jpg"; The file path can be either an absolute path or a relative path//$link = "New text document. xml"; The file path can be either an absolute path or a relative path if (Isset ($link)) {  Header ("http/1.1 303 See Other");  Header ("Location: $link");  Exit;}

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I hope this article is helpful to you in PHP programming.

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