When dots (.) and spaces are used in the names of the input fields, PHP will replace them with an underscore to make them valid PHP variable names.
<!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
function display_form() {
echo <<<HTML
<form action = "$_SERVER[SCRIPT_NAME]" method="post">
First name: <input type="text" name="first.name"><br />
Last name: <input type="text" name="last name"><br />
Phone: <input type="text" name="%phone"><br />
<input type="submit" name="submit" value="submit" />
</form>
HTML;
}
// check for submit button
if (isset($_POST['submit'])) {
foreach ($_POST as $key =>$values) {
echo $key, "=>", $values, '<br />';
}
}
else {
display_form();
}
?>
</p>
</body>
</html>
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