fields.phpi
<?php
class FormField {
public $value = null;
public $fieldName;
protected $submitted = false;
public function __construct($fieldName) {
$this->fieldName = $fieldName;
$this->clean();
}
public function answered() {
if ($this->submitted) {
if ($this->value === '') {
echo "<p>You need to enter a {$this->fieldName}!</p>\n";
} else {
return true;
}
}
return false;
}
protected function clean() {
if (isset($_POST[$this->fieldName])) {
$this->submitted = true;
$value = $_POST[$this->fieldName];
$value = trim($value);
$value = htmlentities($value);
$this->value = $value;
}
}
}
class ColorField extends FormField {
public function background() {
if ($this->value == 'white') {
$color = 'green';
} else {
$color = 'white';
}
return $color;
}
protected function clean() {
parent::clean();
if (isset($this->value)) {
$this->value = strtolower($this->value);
}
}
}
?>
The final code: color.php
<?php
include_once('/home/USERNAME/includes/fields.phpi');
$color = new ColorField('color');
$name = new FormField('name');
?>
<!doctype html>
<html lang="en">
<head>
<meta charset="utf-8">
<title>Your Favorite Color</title>
<style>
body {
margin: 10em;
padding: 2em;
border: solid .2em green;
}
h1 {
text-align: center;
}
</style>
</head>
<body>
<h1>PHP Color Extravaganza</h1>
<?php IF ($color->answered() && $name->answered()):?>
<p style="color: <?php echo $color->value; ?>; background-color: <?php echo $color->background(); ?>">
You said your favorite color was <?php echo $color->value; ?>.
Thanks, <?php echo $name->value; ?>!
</p>
<?php
$recipient = 'yourname@example.com';
$subject = 'Favorite color of ' . $name->value;
$message = $name->value . ' said their favorite color was ' . $color->value . '.';
$message .= "\n\n";
$message .= "Browser: " . $_SERVER['HTTP_USER_AGENT'] . "\n";
$message .= "IP Address: " . $_SERVER['REMOTE_ADDR'] . "\n";
mail($recipient, $subject, $message);
?>
<?php ENDIF; ?>
<form method="post" action="color.php">
<p>
What is your favorite color?
<input type="text" name="color" value="<?php echo $color->value; ?>" />
</p>
<p>
What is your name?
<input type="text" name="name" value="<?php echo $name->value; ?>" />
</p>
<input type="submit" />
</form>
</body>
</html>
