A cookie about the problem, I hope the great God help me A, thank you, say where the wrong

A cookie question, I hope the great God help me, thank you, say what is wrong?

PHP Code

Error:
Hello, you are the first time to login!
Warning:cannot Modify header Information-headers already sent by (output started at D:\LAMP\AppServ\www\cookie\lastVisi T.php:4) in D:\LAMP\AppServ\www\cookie\lastVisit.php on line 6


------Solution--------------------
So change the code ... In addition, if it is a UTF-8 encoded document, be careful not to have B

PHP Code

$first = False;if (Empty ($_cookie[' lastvisit ')) {    $first = TRUE;    Setcookie ("Lastvisit", Date (' y-m-d h:i:s '), time () + 30 * 24 * 3600);} else {    $first = FALSE;    Setcookie ("Lastvisit", Date (' y-m-d h:i:s '), time () + 30 * 24 * 3600);} if ($first) {    echo "Hello, you are the first to log in!" ";} else {    echo "Your last access Time is". $_cookie[' lastvisit ');}
------Solution--------------------
