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PHP 101 (part 2): Calling All Operators
Use PHP to process Web forms, and get to grips with operators and conditional statements.

| ...And Function |

Now for the other half of the puzzle: the message.php script. This script reads the data submitted by the user and "does something with it". Here is message.php:


<html>
<head></head>
<body>

<?php
// retrieve form data
$input = $_POST['msg'];
// use it
echo "You said: <i>$input</i>";
?>

</body>
</html>


When you enter some data into form.htm (let's say "Boo"), and submit it, the form processor message.php will read it and display it to you ("You said: Boo"). Thus, whenever a form is submitted to a PHP script, all variable-value pairs within that form automatically become available for use within the script, through a special PHP container variable: $_POST. You can then access the value of the form variable by using its "name" inside the $_POST container, as I did in the script above.

Obviously, PHP also supports the GET method of form submission. All you need to do is change the "method" attribute to "get", and retrieve values from $_GET instead of $_POST. The $_GET and $_POST variables are actually a special type of PHP animal called an array, which I'll be teaching you about shortly. Don't worry too much about it at the moment, just make sure you're comfortable with retrieving simple values from a form with PHP, and then scroll on down to learn about some more operators that are useful in this context.


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