<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<html>
<head>
<title>Untitled</title>
</head>
<body>
<?php
/* if the "submit" variable does not exist,
* the form has not been submitted - display initial page */if(!isset($_POST['submit'])){
?>
<form action="<?php echo $_SERVER['SCRIPT_NAME']; ?>" method="post">
Enter your age: <input name="age" size="2">
<input type="submit" name="submit" value="Go">
</form>
<?php
}
else{
/* if the "submit" variable exists,
* the form has been submitted - look for and process form data
*/ // display result
$age = $_POST['age'];
if($age >= 21){
echo 'Come on in, we have alcohol and music awaiting you!';
}
else{
echo 'You\'re too young for this club,
come back when you\'re a little older';
}
}
?>
<!--
Use $_SERVER['SCRIPT_NAME'] instead of $_SERVER['PHP_SELF'].
because
$_SERVER['PHP_SELF'] will contain not just login.php, but the entire login.php/nearly_arbitrary_string.
-->
</body>
</html>
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