这样就算会了PHP么？-9

<?php
    if (!isset($_COOKIE["visittime"])) {
        setcookie("visittime", date("y-m-d H:i:s"));
        echo "welcome to visit this website first time.";
        echo "<br>";
    } else {
        setcookie("visittime", date("y-m-d H:i:s"), time() + 60);
        echo "you visit our site's last time is : " .$_COOKIE["visittime"];
        echo "<br>";
    }
    echo " you visite site this time is : ".date("y-m-d H:i:s");
    
?>