Unnamed

<?php

class Validator {

	private $data = array();
	private $errors = array();
	private $validation;
	
	public function __construct($data = '') 
	{
		if (isset($data)) {
			$this->data = $data;
		} 
	}

	private function setError($error) 
	{
		$this->errors[] = $error;
	}
	
	public function getErrors() 
	{
		return $this->errors;
	}
	
	public function getUniqueErrors()
	{
		return array_unique($this->errors);
	}
	
	public function isValid() 
	{
		return sizeof($this->errors) < 1 ? true : false;
	}
	
	public function addRule($fields, $rule, $message) 
	{
		if (array_key_exists($fields, $this->data)) {
			if ($rule instanceof iRule) {
				$this->validation = $rule;	
				
				if (!$this->validation->check($this->data[$fields])) {
					$this->setError($message);
				}
			}
		}


	}
}

interface iRule {
	public function check($word);
}

class RuleLength implements iRule {
	
	private $rules = array();
	
	public function __construct($minimum) 
	{
		$this->rules['min'] = $minimum;
	}
	
	public function check($word) 
	{
		$size = strlen($word);
		return ($size >= $this->rules['min']) ? true : false;	
	}
}

/*
 * Checks if the word is set or not
 */

class RuleRequired implements iRule {
	
	public function __construct() {}
	
	public function check($word) 
	{
		$size = strlen($word);
		return ($size > 0) ? true : false;	
	}
}

class RuleRegex implements iRule {
	
	private $rules = array();
	
	public function __construct($pattern) 
	{
		$this->rules['pattern'] = $pattern;
	}
	
	public function check($word) 
	{
		return (preg_match($this->rules['pattern'], $word) != 0);
	}
}

if (isset($_POST['send'])) {
	$val = new Validator($_POST);
	
	$val->addRule('username', new RuleRequired(), 'Empty field!');
	
	$ruleRequired = array(
				   'username' => 'Username left empty!',
				   'age' => 'Age is empty',
				   'school' => 'School textbox is empty!'
				   );
	
	foreach ($ruleRequired as $key => $value) {
		$val->addRule($key, new RuleRequired(), $value);
	}
	
	$ruleRequired = array(
					'username' => array(new RuleRegex('(^[0-9]+$)'), 'Username must be numbers!'),
					'age' => array(new RuleRegex('(^[0-9]+$)'), 'Age must be only numbers!'),
					'school' => array(new RuleRegex('(^[A-Z]+$)'), 'School must be caps on!')
					);
	
	foreach ($ruleRequired as $key => $value) {
		$val->addRule($key, $value[0], $value[1]);
	}
	
	if ($val->isValid()) {
		echo 'It is OK';
	} else {

		foreach ($val->getUniqueErrors() as $value) {
			echo "<b>$value</b><br />";
		} 
	}
}

?>
<form action="<?php echo $_SERVER['PHP_SELF']; ?>" method="POST">
	username :<input type="text" name="username"><br>
	age: <input type="text" name="age"><br>
	school: <input type="text" name="school"><br>
	<input type="submit" name="send" value="Send Data" />
</form>