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我得到的错误：

Cannot modify header information - headers already sent by (output started at 
/home/spikes/public_html/index.php:17) in /home/spikes/public_html/functions.php on line 58

索引.php：

<body>
    <section id="mainWrapper">
        <section>
            <h1>Spikes.co.il</h1>
        </section>
        <?php include('nav.php');?> //line 17
        ....

函数.php：

function createSession($userid,$firstname)
{
    $expire=time()+60*60*24*30;
    setcookie("usid", $userid, $expire);
    setcookie("usname", $firstname, $expire);
}

我真的不明白为什么会这样。。

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