Something is wrong. But now working fine

cookie1.php

<?php
if (isset($_COOKIE['counter'])) {
    $counter = $_COOKIE['counter'];
    echo $counter;
    $counter++;
    setcookie('counter', $counter, time() + 60*60*24*30, '/', '', false, true);
} else {
    setcookie('counter', 1, time() + 60*60*24*30, '/', '', false, true);
}

cookie2.php

<?php
if (isset($_COOKIE['counter'])) {
    $counter = $_COOKIE['counter'];
    if ($counter%2 == 0) {
        echo "Even";        
    } else {
        echo "Odd";        
    }
    echo $counter;
    $counter++;    
    setcookie('counter', $counter, time() + 60*60*24*30, '/', '', false, true);
} else {
    setcookie('counter', 1, time() + 60*60*24*30, '/', '', false, true);
}

@m6w6 no favicon is here see the php script .

@ramondelafuente Yes the script was started with php -S . Sorry for the delay guyes, I missed to see the comments. I am not sure why gist comments are not mailed by github.