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?php

session_start();

/**
 * 	Counter class
 * 	@version 0.1
 *	@author Monchovarela <nakome@gmail.com>
 */
class Counter{

	/**
	 * Constructor
	 */
	public function __construct($file = ''){
		$this->file = ($file) ? $file : 'counter.txt';
		$this->val = '';
	}
	/**
	 * Make file
	 */
	public function makeFile(){
		// Check if a text file exists. If not create one and initialize it to zero.
		if (!file_exists($this->file)) {
			$f = fopen($this->file, "w");
			fwrite($f,"0");
			fclose($f);
		}
	}
	/**
	 * Get users
	 */
	public function getUsers(){
		// Read the current value of our counter file
		$f = fopen($this->file,"r");
		$this->val = fread($f, filesize($this->file));
		fclose($f);
	}
	/**
	 * Set users
	 */
	public function setUser(){
		// Has visitor been counted in this session?
		// If not, increase counter value by one
		if(!array_key_exists('hasVisited', $_SESSION)){
			$_SESSION['hasVisited']="yes";
			$this->val++;
			$f = fopen($this->file, "w");
			fwrite($f, $this->val);
			fclose($f); 
		}
	}
	/**
	 * Init class
	 */
	public function init(){
		$this->makeFile();
		$this->getUsers();
		$this->setUser();
		return $this->val;
	}
}


$counter = new Counter();
$number = $counter->init();
echo "You are visitor number $number to this site";