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  Tutorial: PHP Development Output buffering, and how it can change your life Tutorial

Output buffering is a powerful feature of PHP 4.0. that lets developers create advanced and efficient programs very easily. This article covers the HTTP header, how output buffering helps you deal with it, and describes several advanced usages of the outp

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Output buffering

Output buffering is, in my biased opinion, one of the neater features of PHP 4.0. Although fairly simple in concept, output buffering is a powerful feature that lets developers create advanced and efficient programs very easily.

In this article, I'll explain the HTTP header, how output buffering helps you deal with it, and describe several advanced usages of the output buffering feature.

What is this header, and why should you care about it? For every request made using the HTTP protocol, there are essentially two parts that make up the response from the Web server ? the header and the body. For example, if you have a small text file, named 'example.txt', that contains the text 'Hello, world!' in your Web server's document root.

The first (in this case larger) part of this request is the HTTP header. While end users do not see the HTTP header in the browser, it contains information that the browser uses, such as the content type, protocol version used, the time the document was last modified, and more. There aren't too many rules (for practical purposes) how the HTTP header should look like and behave. Generally, it's composed from lines of the format.


 

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