Sleep tight!

<?php
$application = 'spotify';
$kill = exec('pidof '.$application);
$minutes = 120;

exec('clear');
echo "All set ready to go! \n Going to quit ". $application ." in ". $minutes ." minutes...\n";
while($minutes != 0)
{
    $minutes = $minutes - 1;
    sleep(60);
    echo $minutes." minutes left \n";
}

exec('kill '.$kill);