You want to use the same HTML page to create a form and then process the data entered into it.
Use the $_SERVER['REQUEST_METHOD'] variable to determine whether the request was submitted with the get or post method.
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
"DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="EN" lang="EN">
<head>
<title>PHP</title>
<meta Name="Author" Content="Hann So">
</head>
<body>
<p>
<?php
<?php
// if the get method is used, display the form.
// if the post method is used process the form.
// $_SERVER['SCRIPT_NAME'] is the path to the current script
if ($_SERVER['REQUEST_METHOD'] == 'GET') {
?>
<form action = "<?php echo $_SERVER['SCRIPT_NAME'] ?>" method="post">
Enter first name
<input type="text" name="first_name" />
<input type="submit" value="Submit" />
</form>
<?php } else {
echo 'Hello, '.$_POST['first_name'];
}
?>
</p>
</body>
</html>
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