我想检查一下存在的cookie:
<?php
if(!isset($_COOKIE['cookie'])){
echo "new";
setcookie('cookie', true, time() + 31536000);
} else {
echo "none";
}
?>
但是当我调用脚本时,它会输出我:
new
Warning: Cannot modify header information - headers already sent by (output started at /var/www/virtual/tekkkz/html/php/cookie.php:4) in /var/www/virtual/tekkkz/html/php/cookie.php on line 5
每次都这样,如果我已经打过电话了。
我错了什么?