PHP: Hypertext Processor
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PHP stands for PHP Hypertext Preprocessor. It is a programming language that is put into HTML to make interactive web pages made by the server.
[edit] Example
An example Hello World program:
<html>
<head>
<title>Hello, World!</title>
</head>
<body>
<?php
print("Hello, World!");
?>
</body>
</html>

