file_exists function for cookies

[Anon]

For example a set a cookies with that code

$exp_time = time()+7200;
setcookie("abc", "$REMOTE_ADDR", $exp_time);

then how can i use file exists funcition in php for cookie like if cookie exists:

if (file_exists(abc))
{
echo "abc";
}
else
{
$exp_time = time()+7200;
setcookie("abc", "$REMOTE_ADDR", $exp_time);
}

please hep me!