headers already sent error

 

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  • How to fix “Headers already sent” error in PHP 11 answers

    • cookies in HTTP will be transferred using the headers. setcookie() therefore is just a wrapper around header() and cannot being used if there were already output in that script.

    I guess that the output is an error message triggered by the mysql_* functions or whitespace|content before the opening <?php tag

    我有类似的问题。原因是你可能在php标签之前有一个空白区域。删除空间，你很好去。

    use ob_start(); after php tag

    $user = mysql_real_escape_string($_POST['login']);

    to

    ob_start();

    $user = mysql_real_escape_string($_POST['login']);

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