contact.php

<?php
require_once("db.php");					/* Database Class */
require_once('utils/is_email.php');		/* Email Validation Script */

/* Handle Ajax Request */
if(isset($_POST['newcontact'])){
	$contact = new Contact();
	unset($contact);
}
else{
	header('Location: /');
}

/* Class Contact */
class Contact{
	
	private $db; 						/* the database obj */
	
	private $errors 		= array();  /* holds error messages */
	private $num_errors;   				/* number of errors in submitted form */
	
	public function __construct(){
		$this->db = new DB();
		if(isset($_POST['newcontact']))
			$this->processNewMessage();
		else
			header("Location: /");
	}

	public function processNewMessage(){
		
		$email		= $_POST['email'];
		$name		= $_POST['name'];
		$url		= $_POST['url'];
		$message	= $_POST['message'];
		
		/* Server Side Data Validation */
		
		/* Email Validation */
		if(!$email || mb_strlen($email = trim($email)) == 0)
			$this->setError('email','required field');
		else{
			if(!is_email($email))
				$this->setError('email', 'invalid email');
			else if(mb_strlen($email) > 120)
				$this->setError('email', 'too long! 120');
		}
		
		/* Name Validation */
		if(!$name || mb_strlen($name = trim($name)) == 0)
			$this->setError('name', 'required field');
		else if(mb_strlen(trim($name)) > 120)
			$this->setError('name', 'too long! 120 characters');
		
		
		/* Message Validation */ 
		if(!$message || mb_strlen($message = trim($message)) == 0)
			$this->setError('message','required field');
		elseif(mb_strlen($message) > 300)
			$this->setError('message', 'too long! 300 characters');
			
		/* Errors exist */
		if($this->countErrors() > 0){
			$json = array(
				'result' => -1, 
				'errors' => array(
						array('name' => 'email'		,'value' => $this->error_value('email')),
						array('name' => 'name' 		,'value' => $this->error_value('name')),
						array('name' => 'message'	,'value' => $this->error_value('message'))
							)
				);				
			$encoded = json_encode($json);
			echo $encoded;
			unset($encoded);
		}
		/* No errors, insert in db*/
		else
		{
			if(($ret = $this->db->dbNewMessage($email,$name,$message,$url)) > 0){
				$json = array('result' 		=> 1);				
			}	
			else
				$json = array('result' 		=> -2); /* something went wrong in database insertion  */
			$encoded = json_encode($json);
			echo $encoded;
			unset($encoded);
		}
	}
	
	
	public function setError($field, $errmsg){
		$this->errors[$field] 	= $errmsg;
		$this->num_errors 	= count($this->errors); //hitung error
	}
	
	public function error_value($field){
		if(array_key_exists($field,$this->errors))
			return $this->errors[$field];
		else
			return '';
	}
	
	public function countErrors(){
		return $this->num_errors;
	}
};
?>