First Example

first.php

The XHTML markup....

<form action="first.php" method="post"><p>
Please enter your name: 
<input type="text" name="userName"/><br /><br />
and press one of these buttons 
<input type="submit" name="button" value="A"/>
<input type="submit" name="button" value="B"/>
</p></form>

first.php contains the following:

<?php echo "<?xml version=\"1.0\" encoding=\"UTF-8\"?>\n"; ?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.1//EN" "http://www.w3.org/tr/xhtml1/DTD/xhtml11.dtd" >
<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en-gb">
<head>
<title>A first PHP example</title>
</head>
<body>
<h1>Welcome <?php echo $_POST['userName'] ?></h1>
<p>
I see that you are using a browser type:<br />
 &nbsp; &nbsp; <?php echo $_SERVER['HTTP_USER_AGENT'] ?><br />
from IP address: <?php echo $_SERVER['REMOTE_ADDR'] ?>
<p></p>
<?php
if ( isset($_POST['button']) ) echo 'You pressed button ' . $_POST['button'];
?>
</p>
</p>
</body>
</html>

Things to note about first.php:

PHP code between the <?php and ?> delimiters is interspersed in normal html code
PHP code is executed on the server and the html output sent to the client
PHP code is not sent to the client
The XML header is generated from an echo statement
Use of POST variables
- $_POST['userName']
- $_POST['button']
Use of environment variables
- $_SERVER['HTTP_USER_AGENT']
- $_SERVER['REMOTE_ADDR']

Quick Question

What is the difference between

echo "$userName = " . $userName;
echo '$userName = ' . $userName;

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