在重定向php之前执行代码

Question

我想在txt文件(用户名,用户邮件和IP地址)中写一些信息,然后重定向到另一个html文件.如果我尝试重定向,则文本文件中不会出现任何内容.但是,如果我不重定向到HTML文件,PHP脚本正常工作.我错过了什么？

<?php
$myfile = fopen("newfile.txt", "a") or die("Unable to open file!");
$txt1 = file_get_contents("newfile.txt");
$ip = get_client_ip_server();
$txt2 = $_COOKIE["userName"] ."\t" .$_COOKIE["userEmail"]." \t".$ip. "\r\n";
$txt3 = $txt1 . $txt2;
fwrite($myfile, $txt3);
fclose($myfile);
die();
header( "HTTP/1.0 302 Found" );
header( "Status: 302" ); # this is for chrome compliance
header( "Location: general.html" . $_SERVER["REQUEST_URI"] );
// Function to get the client ip address
function get_client_ip_server() {
$ipaddress = '';
      if (getenv('HTTP_CLIENT_IP'))
            $ipaddress =getenv('HTTP_CLIENT_IP');
        else if(getenv('HTTP_X_FORWARDED_FOR'))
            $ipaddress = getenv('HTTP_X_FORWARDED_FOR');
        else if(getenv('HTTP_X_FORWARDED'))
            $ipaddress = getenv('HTTP_X_FORWARDED');
        else if(getenv('HTTP_FORWARDED_FOR'))
            $ipaddress = getenv('HTTP_FORWARDED_FOR');
        else if(getenv('HTTP_FORWARDED'))
            $ipaddress = getenv('HTTP_FORWARDED');
        else if(getenv('REMOTE_ADDR'))
            $ipaddress = getenv('REMOTE_ADDR');
        else
            $ipaddress = 'UNKNOWN';
        return $ipaddress;
}
?>

谢谢你的帮助

Answer 1

好的,有人发布了答案,所以我也会.

die();在标题之前,标题永远不会发生.在标题后放置模具.

参考文献:

• http://php.net/manual/en/function.die.php
• http://php.net/manual/en/function.header.php

编辑:

成功测试您的代码后,我的建议是die();在标题之后移动; 确保饼干确实设置/不为空,你(可能)需要删除$_SERVER["REQUEST_URI"]从header( "Location: general.html" . $_SERVER["REQUEST_URI"] );

使用header( "Location: general.html" . $_SERVER["REQUEST_URI"] );失败让我重定向到general.html并删除$_SERVER["REQUEST_URI"]重定向到general.html.

参考文献:

• 检查PHP cookie是否存在以及是否未设置其值
• http://php.net/manual/en/function.isset.php
• http://php.net/manual/en/function.empty.php

用这个作为测试:

<?php
$myfile = fopen("newfile.txt", "a") or die("Unable to open file!");
$txt1 = file_get_contents("newfile.txt");
$ip = get_client_ip_server();
// $txt2 = $_COOKIE["userName"] ."\t" .$_COOKIE["userEmail"]." \t".$ip. "\r\n";

$txt2 = "Username cookie"  ."\t" . " Email cookie " ." \t".$ip. "\r\n";

$txt3 = $txt1 . $txt2;
fwrite($myfile, $txt3);
fclose($myfile);

header( "HTTP/1.0 302 Found" );
header( "Status: 302" ); # this is for chrome compliance

header( "Location: general.html");
// header( "Location: general.html" . $_SERVER["REQUEST_URI"] );

die();

// Function to get the client ip address
function get_client_ip_server() {
$ipaddress = '';
      if (getenv('HTTP_CLIENT_IP'))
            $ipaddress =getenv('HTTP_CLIENT_IP');
        else if(getenv('HTTP_X_FORWARDED_FOR'))
            $ipaddress = getenv('HTTP_X_FORWARDED_FOR');
        else if(getenv('HTTP_X_FORWARDED'))
            $ipaddress = getenv('HTTP_X_FORWARDED');
        else if(getenv('HTTP_FORWARDED_FOR'))
            $ipaddress = getenv('HTTP_FORWARDED_FOR');
        else if(getenv('HTTP_FORWARDED'))
            $ipaddress = getenv('HTTP_FORWARDED');
        else if(getenv('REMOTE_ADDR'))
            $ipaddress = getenv('REMOTE_ADDR');
        else
            $ipaddress = 'UNKNOWN';
        return $ipaddress;
}
?>

屈服:(数字仅为示例)

Username cookie  Email cookie   11.22.33.44

Username cookie  Email cookie   11.22.33.44

Username cookie  Email cookie   11.22.33.44

关于 $_SERVER["REQUEST_URI"]

'REQUEST_URI'为了访问此页面而给出的URI; 例如,'/ index.html'.

• http://php.net/manual/en/reserved.variables.server.php

也可以看看:

• $ _SERVER ['REQUEST_URI']和$ _GET ['q']有什么区别？

将错误报告添加到文件的顶部,这将有助于查找错误.

<?php 
error_reporting(E_ALL);
ini_set('display_errors', 1);

// Then the rest of your code

旁注:显示错误只能在分段中完成,而不能在生产中完成.

编辑#2:

在测试了我认为阻止重定向的内容之后,您的文件可能已经保存为带有BOM(字节顺序标记)的UTF-8,如果是这种情况,那么您将在标头之前输出.错误报告将通知您.

您可以将该文件另存为ANSI,也可以将UTF-8保存为无BOM.

请教:

• 如何修复PHP中的"Headers already sent"错误
• https://en.wikipedia.org/wiki/Byte_order_mark