When writing PHP scripts, it is not necessary to understand every detail of the HTTP protocol. I would be straying to include a treatise here, but you ought to have enough understanding so that you could simulate a connect by using telnet. You may know that Web servers listen on port 80 by default. HTTP is a text-based protocol, so it's not hard to telnet directly to a Web server and type a simple request. HTTP has several commands that should be familiar; GET and POST are used most often. HEAD is a command that returns just the headers for a request. Browsers use this command to test whether they really want to get an entire document.
It is especially helpful to simulate an HTTP connection when your script sends custom headers.Request I made to the PHP home page. The text in bold is what I typed. The remote server returned everything else.
Simulating an HTTP Connection
PHP Related Interview Questions
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An Introduction To Php
Variables, Operators, And Expressions
Classes And Objects
I/o And Disk Access
Time, Date, And Configuration Functions
Parsing And String Evaluation
Sorting Searching And Random Numbers
Integration With Html
Efficiency And Debugging
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