无法修改标题信息 [英] Cannot modify header information

问题描述

可能存在重复：

已由PHP发送的标题

我收到以下来自下面的代码的错误，我不完全确定为什么。如果你能告诉我如何解决这个问题，那会很棒。

I am getting the following error from the following code, and I am not entirely sure why. If you could tell me how to fix it, that would be great. Thanks in advanced.

警告：无法修改标题信息 - 标题信息已经由第45行的（输出开始于...）发送。

Warning: Cannot modify header information - headers already sent by (output started at...) on line 45.

<?php


    // Initialization
    $conn = mysql_connect(DB_HOST,DB_USER,DB_PASSWORD);
    mysql_select_db(DB_NAME, $conn);

    // Error checking
    if(!$conn) {
        die('Could not connect ' . mysql_error());
    }

    // Localize the GET variables
    $ref  = isset($_GET['ref']) ? $_GET['ref'] : "";

    // Protect against sql injections
    // Insert the score
    $retval = mysql_query("INSERT INTO $table(
            site
        ) VALUES (
            '$ref'
        )",$conn);

    if($retval) {
        echo "Successfull";
    } else {
        echo "Unsuccessfull " . mysql_error();
    }

    mysql_close($conn);
?>
<?php
$url = $_GET['url'];
    $loc = 'Location: '. $url;
    header($loc);
exit;
?>

推荐答案

信息到头部之前的浏览器。

Take out the echo calls, you can't send information to the browser before the headers.

您可以尝试这样的事情，以显示是否发生错误：

You can try something like this to still show if an error happens:

if(!$retval) {
    echo "Unsuccessfull " . mysql_error();
}

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