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PHP

PHP, the Hypertext Preprocessor, is a server-side scripting language (almost identical to the javascript "language") mainly used to transform data from files or databases to HTML output.

A client can interact with the server on submission of a form inside an html document. The form elements are inputs for the PHP functions.

The PHP equivalent of the previously stated JS function:

$message = $_REQUEST['message']; say($message); function say($msg){ $output= '<p>you say: '.$msg.'</p>'; print($output); }

PHP code is in fact on the server-side embedded inside a template, setting the variables and deciding which blocks of HTML code to select/import in building the HTML site output (a page).

Embedded inside a HTML document, the example PHP code creates a site like this:

<?php $message = $_REQUEST['message']; function say($msg){ if($msg != ""){ $output= '<p>you say: '.$msg.'</p>'; print($output); }else{ print("message is empty"); } } ?> <html> <head><title>Your message</title></head> <body> <?php say($message); ?> <form action="<?php echo $PHP_SELF; ?>"> Enter another message: <input type="text" name="message" value="" /> <input type="submit" value="say" /> </form> </body> </html>

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