<?php
error_reporting(0);

header('Content-Type: text/html; charset=UTF-8');

$myfile = 'linksDB.txt';
$lines = file($myfile);

function getRandom($array){
    $randLine = array_rand($array, 1);
    return $randLine;
}

if( $_COOKIE['_visited'] ):
    $_arr = $_COOKIE['_visited']; //get cookie
    $_visited = unserialize($_arr); //unserialize
    $_lines = $lines; //get lines
    foreach($_visited as $key=>$val): //remove visited
        unset($_lines[$key]);
    endforeach;

    if(count($_lines)==0):
        setcookie('_visited','',time()-3600);
        $rand = getRandom($lines);
        $setArr = array($rand=>$rand);
        $str = urldecode(serialize($setArr));
        setcookie('_visited', $str);
        echo $lines[$rand];
        return;
    endif;

    $_newSite = getRandom($_lines);
    $_visited[$_newSite] = $_newSite;
    $str = urldecode(serialize($_visited));
    setcookie('_visited', $str);
    echo $lines[$_newSite];

else: //for the first time
    $rand = getRandom($lines);
    $setArr = array($rand=>$rand);
    $str = urldecode(serialize($setArr));
    setcookie('_visited', $str);
    echo $lines[$rand];
endif;

/* End of handler.php */