php 留言板結合會員登入留言,但卡在重整就會"會員登出"....

本人因為大四專題的關係製作了一個購物網站結合了資料庫
有與資料庫連結的互動網站有留言板、會員管理、購物車
但目前製作的互動留言板網站發生三個bug
第一個是會員登入以後,重新整理就會直接登出會員,之後就必須再重新登入..
第二個是會員登入以後,留言,送出以後卻無法轉向頁面到留言板首頁,頁面上方跳出錯誤訊息
錯誤訊息如下:
Warning: Cannot modify header information - headers already sent by (output started at /home/u7643403/public_html/guestbook/post.php:5) in /home/u7643403/public_html/guestbook/post.php on line 134
第三個是會員登入以後,按下登出管理,跳出錯誤訊息
錯誤訊息如下
Warning: Cannot modify header information - headers already sent by (output started at /home/u7643403/public_html/guestbook/post.php:5) in /home/u7643403/public_html/guestbook/post.php on line 29

我找不到到底那兩段的程式碼有問題...
嘗試了很多次,也詢問過一些人
有說要用session變數..
我有放進去在程式碼最上方...後來會員登入可以了
但重新整理卻會直接登出....
也有說header不能有已輸出的資料..
但會員姓名,性別,e-mail都需要顯示並和留言與留言主題一起輸出...
我不太懂到底怎麼使用這個變數
希望各位高手指點迷津...
post.php 此為留言板的程式碼..
<?php session_start(); 
//開啟session的語法 要放在檔案最上方?>

<?php require_once('../Connections/connSQL.php'); ?>
<?php
//initialize the session
if (!isset($_SESSION)) {
  session_start();
}

// ** Logout the current user. **
$logoutAction = $_SERVER['PHP_SELF']."?doLogout=true";
if ((isset($_SERVER['QUERY_STRING'])) && ($_SERVER['QUERY_STRING'] != "")){
  $logoutAction .="&". htmlentities($_SERVER['QUERY_STRING']);
}

if ((isset($_GET['doLogout'])) &&($_GET['doLogout']=="true")){
  //to fully log out a visitor we need to clear the session varialbles
  $_SESSION['MM_Username'] = NULL;
  $_SESSION['MM_UserGroup'] = NULL;
  $_SESSION['PrevUrl'] = NULL;
  unset($_SESSION['MM_Username']);
  unset($_SESSION['MM_UserGroup']);
  unset($_SESSION['PrevUrl']);
	
  $logoutGoTo = "index.php";
  if ($logoutGoTo) {
    header("Location: $logoutGoTo");             <-----**line29**
    exit;
  }
}
?>
<?php
if (!isset($_SESSION)) {
  session_start();
}
$MM_authorizedUsers = "";
$MM_donotCheckaccess = "true";

// *** Restrict Access To Page: Grant or deny access to this page
function isAuthorized($strUsers, $strGroups, $UserName, $UserGroup) { 
  // For security, start by assuming the visitor is NOT authorized. 
  $isValid = False; 

  // When a visitor has logged into this site, the Session variable MM_Username set equal to their username. 
  // Therefore, we know that a user is NOT logged in if that Session variable is blank. 
  if (!empty($UserName)) { 
    // Besides being logged in, you may restrict access to only certain users based on an ID established when they login. 
    // Parse the strings into arrays. 
    $arrUsers = Explode(",", $strUsers); 
    $arrGroups = Explode(",", $strGroups); 
    if (in_array($UserName, $arrUsers)) { 
      $isValid = true; 
    } 
    // Or, you may restrict access to only certain users based on their username. 
    if (in_array($UserGroup, $arrGroups)) { 
      $isValid = true; 
    } 
    if (($strUsers == "") && true) { 
      $isValid = true; 
    } 
  } 
  return $isValid; 
}

$MM_restrictGoTo = "memberlogin.php";
if (!((isset($_SESSION['MM_Username'])) && (isAuthorized("",$MM_authorizedUsers, $_SESSION['MM_Username'], $_SESSION['MM_UserGroup'])))) {   
  $MM_qsChar = "?";
  $MM_referrer = $_SERVER['PHP_SELF'];
  if (strpos($MM_restrictGoTo, "?")) $MM_qsChar = "&";
  if (isset($_SERVER['QUERY_STRING']) && strlen($_SERVER['QUERY_STRING']) > 0) 
  $MM_referrer .= "?" . $_SERVER['QUERY_STRING'];
  $MM_restrictGoTo = $MM_restrictGoTo. $MM_qsChar . "accesscheck=" . urlencode($MM_referrer);
  header("Location: ". $MM_restrictGoTo); 
  exit;
}
?>
<?php
if (!function_exists("GetSQLValueString")) {
function GetSQLValueString($theValue, $theType, $theDefinedValue = "", $theNotDefinedValue = "") 
{
  if (PHP_VERSION < 6) {
    $theValue = get_magic_quotes_gpc() ? stripslashes($theValue) : $theValue;
  }

  $theValue = function_exists("mysql_real_escape_string") ? mysql_real_escape_string($theValue) : mysql_escape_string($theValue);

  switch ($theType) {
    case "text":
      $theValue = ($theValue != "") ? "'" . $theValue . "'" : "NULL";
      break;    
    case "long":
    case "int":
      $theValue = ($theValue != "") ? intval($theValue) : "NULL";
      break;
    case "double":
      $theValue = ($theValue != "") ? doubleval($theValue) : "NULL";
      break;
    case "date":
      $theValue = ($theValue != "") ? "'" . $theValue . "'" : "NULL";
      break;
    case "defined":
      $theValue = ($theValue != "") ? $theDefinedValue : $theNotDefinedValue;
      break;
  }
  return $theValue;
}
}
$editFormAction = $_SERVER['PHP_SELF'];
if (isset($_SERVER['QUERY_STRING'])) {
  $editFormAction .= "?" . htmlentities($_SERVER['QUERY_STRING']);
}

if ((isset($_POST["MM_insert"])) && ($_POST["MM_insert"] == "form1")) {
  $insertSQL = sprintf("INSERT INTO board (boardname, boardgender, boardsubject, boardtime, boardip, boardcontent, boardemail) VALUES (%s, %s, %s, %s, %s, %s, %s)",
                       GetSQLValueString($_POST['boardname'], "text"),
                       GetSQLValueString($_POST['boardgender'], "text"),
                       GetSQLValueString($_POST['boardsubject'], "text"),
                       GetSQLValueString($_POST['boardtime'], "date"),
                       GetSQLValueString($_POST['boardip'], "text"),
                       GetSQLValueString($_POST['boardcontent'], "text"),
                       GetSQLValueString($_POST['boardemail'], "text"));

  mysql_select_db($database_connSQL, $connSQL);
  $Result1 = mysql_query($insertSQL, $connSQL) or die(mysql_error());

  $insertGoTo = "/guestbook/index.php";
  if (isset($_SERVER['QUERY_STRING'])) {
    $insertGoTo .= (strpos($insertGoTo, '?')) ? "&" : "?";
    $insertGoTo .= $_SERVER['QUERY_STRING'];
  }
  header(sprintf("Location: %s", $insertGoTo));              <----**line134**
}

$colname_Recordset1 = "-1";
if (isset($_SESSION['MM_Username'])) {
  $colname_Recordset1 = $_SESSION['MM_Username'];
}
mysql_select_db($database_connSQL, $connSQL);
$query_Recordset1 = sprintf("SELECT * FROM memberdata WHERE m_username = %s", GetSQLValueString($colname_Recordset1, "text"));
$Recordset1 = mysql_query($query_Recordset1, $connSQL) or die(mysql_error());
$row_Recordset1 = mysql_fetch_assoc($Recordset1);
$totalRows_Recordset1 = mysql_num_rows($Recordset1);
?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">;
<html xmlns="http://www.w3.org/1999/xhtml">;
<head>  

評論

  • 首先我想說的是……
    如果你的程式碼盡是一堆dreamweaver產生的「廢code」。
    那你光是要debug起來就非常的麻煩。
    再來有很多的狀況都可能造成「事先的輸出」。
    其中一種就是檔案編碼的utf-8的bom,如果不是選無bom模式的話。
    那麼在檔頭就會有什麼被先輸出只是你看不到。
    良心建議第一個,不要再使用dreamweaver了。
    去重新找一套ide。
    也不要把你原本那混亂的dreamweaver產生的廢code又引繼進來使用。
  • 先寫個簡單的 轉網址 測試測試 header吧
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