“警告:无法修改标头信息-已由标头发送的标头"错误 [英] "Warning: Cannot modify header information - headers already sent by" error
问题描述
可能重复:
PHP已发送的标头
Possible Duplicate:
Headers already sent by PHP
每次尝试提交表单删除表单时，我都会不断收到此错误.
i keep receiving this error each time i try to submit the a form deletion form.
警告:无法修改标题 信息-标头已由发送 (输出开始于 C:\ xampp \ htdocs \ speedycms \ deleteclient.php:47) 在 C:\ xampp \ htdocs \ speedycms \ deleteclient.php 在第106行
Warning: Cannot modify header information - headers already sent by (output started at C:\xampp\htdocs\speedycms\deleteclient.php:47) in C:\xampp\htdocs\speedycms\deleteclient.php on line 106
我的代码有问题吗?我需要进行哪些更改才能使其正常工作?
is there something wrong with my code? what do i need to change to make it work?
<?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;
}
$MM_restrictGoTo = "login.php";
if (!((isset($_SESSION['MM_Username'])) && (isAuthorized("",$MM_authorizedUsers, $_SESSION['MM_Username'], $_SESSION['MM_UserGroup'])))) {
$MM_qsChar = "?";
$MM_referrer = $_SERVER['PHP_SELF'];
if (strpos($MM_restrictGoTo, "?")) $MM_qsChar = "&";
if (isset($QUERY_STRING) && strlen($QUERY_STRING) > 0)
$MM_referrer .= "?" . $QUERY_STRING;
$MM_restrictGoTo = $MM_restrictGoTo. $MM_qsChar . "accesscheck=" . urlencode($MM_referrer);
header("Location: ". $MM_restrictGoTo);
exit;
}
?>
<?php
require_once('Connections/speedycms.php');
$client_id = mysql_real_escape_string($_GET['id']);
$con = mysql_connect($hostname_speedycms, $username_speedycms, $password_speedycms);
if (!$con)
{
die('Could not connect: ' . mysql_error());
}
mysql_select_db("speedycms") or die(mysql_error());
?>
<?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 $theValue;
}
}
if ((isset($_GET['id'])) && ($_GET['id'] != "") && (isset($_POST['deleteForm']))) {
$deleteSQL = sprintf("DELETE FROM tbl_accident WHERE id=%s",
GetSQLValueString($_GET['id'], "int"));
mysql_select_db($database_speedycms, $speedycms);
$Result1 = mysql_query($deleteSQL, $speedycms) or die(mysql_error());
$deleteGoTo = "progress.php";
if (isset($_SERVER['QUERY_STRING'])) {
$deleteGoTo .= (strpos($deleteGoTo, '?')) ? "&" : "?";
$deleteGoTo .= $_SERVER['QUERY_STRING'];
}
header(sprintf("Location: %s", $deleteGoTo));
}
mysql_select_db($database_speedycms, $speedycms);
$query_delete = "SELECT * FROM tbl_accident WHERE id=$client_id";
$delete = mysql_query($query_delete, $speedycms) or die(mysql_error());
$row_delete = mysql_fetch_assoc($delete);
$totalRows_delete = mysql_num_rows($delete);
?>
<p class="form2">Are you sure you wish to <b>delete</b> the record for <?php echo $row_delete['clientName']; ?>?</p>
<form name="form" method="POST" action="<?php echo $deleteAction; ?>">
<p class="form2"><input type="submit" value="Yes" />
<input name="no" type="button" id="no" value="No" />
</p>
<input type="hidden" name="deleteForm" value="form" />
</form>
先谢谢您！
推荐答案
第45-47行:
?>
<?php
这将发送一些换行符作为输出，因此标头已经被分派.只需删除这3行(毕竟这是一个很大的PHP块，不需要结束PHP解析然后再次启动它)，以及第60-62行的类似块，就可以了.
That's sending a couple of newlines as output, so the headers are already dispatched. Just remove those 3 lines (it's all one big PHP block after all, no need to end PHP parsing and then start it again), as well as the similar block on lines 60-62, and it'll work.
请注意，您收到的错误消息实际上为您提供了很多信息，可以帮助您自己找到此错误:
Notice that the error message you got actually gives you a lot of information to help you find this yourself:
警告:无法修改标题 信息-标头已由发送 (输出始于 C:\ xampp \ htdocs \ speedycms \ deleteclient.php:47 ) 在 C:\ xampp \ htdocs \ speedycms \ deleteclient.php 在第106行
Warning: Cannot modify header information - headers already sent by (output started at C:\xampp\htdocs\speedycms\deleteclient.php:47) in C:\xampp\htdocs\speedycms\deleteclient.php on line 106
两个加粗的部分告诉您项目是在标题之前发送输出的位置(第47行)以及项目在输出之后试图发送标题的位置(行106).
The two bolded sections tell you where the item is that sent output before the headers (line 47) and where the item is that was trying to send a header after output (line 106).
这篇关于“警告:无法修改标头信息-已由标头发送的标头"错误的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！
