PHP“；无法修改标题信息"；错误不会消失。_Php

PHP“；无法修改标题信息"；错误不会消失。

php

PHP“；无法修改标题信息"；错误不会消失。,php,Php,我收到以下错误“警告：无法修改标题信息-标题已由发送”，中的答案无法解决此问题谁能帮帮我吗这是我的密码 main\u登录 <!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&

我收到以下错误“警告：无法修改标题信息-标题已由发送”，中的答案无法解决此问题

谁能帮帮我吗

这是我的密码

main\u登录

<!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>
    <title>Untitled Page</title>
</head>
<body>
    <form name="form1" method="post" action="checklogin.php">
    <table style="width:300px;border:0;text-align:center;background-color:#CCCCCC">
        <tr>
            <td>
                <table style="width:100%;background-color:#FFFFFF;border:0;">
                    <tr>
                        <td colspan="3"><strong>Member Login </strong></td>
                    </tr>
                    <tr>
                        <td style="width:78px">Username</td>
                        <td style="width:6px">:</td>
                        <td style="width:294px"><input name="myusername" type="text" id="myusername"></td>
                    </tr>
                    <tr>
                        <td>Password</td>
                        <td>:</td>
                        <td><input name="mypassword" type="text" id="mypassword"></td>
                    </tr>
                    <tr>
                        <td>&nbsp;</td>
                        <td>&nbsp;</td>
                        <td><input type="submit" name="Submit" value="Login"></td>
                    </tr>
                </table>
            </td>
        </tr>
    </table>
    </form>
</body>
</html>


无标题页
会员登录
用户名
:
密码
:

checkLogin.php

<?php
$dbhost = 'localhost';
$dbuser = 'myuse';
$dbpass = 'myPassword';
$dbname = 'myDbName';

// This is an example opendb.php
$conn = mysql_connect($dbhost, $dbuser, $dbpass) or die  ('Error connecting to mysql');
mysql_select_db($dbname);


// username and password sent from form 
$myusername=$_POST['myusername']; 
$mypassword=$_POST['mypassword'];

// To protect MySQL injection (more detail about MySQL injection)
$myusername = stripslashes($myusername);
$mypassword = stripslashes($mypassword);
$myusername = mysql_real_escape_string($myusername);
$mypassword = mysql_real_escape_string($mypassword);

$sql="SELECT * FROM myTable WHERE username='$myusername' and password='$mypassword'";
$result=mysql_query($sql);

// Mysql_num_row is counting table row
$count=mysql_num_rows($result);
// If result matched $myusername and $mypassword, table row must be 1 row

if($count==1){
// Register $myusername, $mypassword and redirect to file "login_success.php"

$_SESSION['myusername'] = $myusername;
$_SESSION['mypassword']   = $mypassword;
header("location:login_success.php");
}
else {
echo "Wrong Username or Password";
}
?>

<?php
session_start();
if(!session_is_registered(myusername)){
header("location:main_login.php");
}
?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
// Check if session is not registered , redirect back to main page. // Put this
code in first line of web page.
<html>
<body>
    Login Successful
</body>
</html>

login\u success.php

<?php
$dbhost = 'localhost';
$dbuser = 'myuse';
$dbpass = 'myPassword';
$dbname = 'myDbName';

// This is an example opendb.php
$conn = mysql_connect($dbhost, $dbuser, $dbpass) or die  ('Error connecting to mysql');
mysql_select_db($dbname);


// username and password sent from form 
$myusername=$_POST['myusername']; 
$mypassword=$_POST['mypassword'];

// To protect MySQL injection (more detail about MySQL injection)
$myusername = stripslashes($myusername);
$mypassword = stripslashes($mypassword);
$myusername = mysql_real_escape_string($myusername);
$mypassword = mysql_real_escape_string($mypassword);

$sql="SELECT * FROM myTable WHERE username='$myusername' and password='$mypassword'";
$result=mysql_query($sql);

// Mysql_num_row is counting table row
$count=mysql_num_rows($result);
// If result matched $myusername and $mypassword, table row must be 1 row

if($count==1){
// Register $myusername, $mypassword and redirect to file "login_success.php"

$_SESSION['myusername'] = $myusername;
$_SESSION['mypassword']   = $mypassword;
header("location:login_success.php");
}
else {
echo "Wrong Username or Password";
}
?>

<?php
session_start();
if(!session_is_registered(myusername)){
header("location:main_login.php");
}
?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
// Check if session is not registered , redirect back to main page. // Put this
code in first line of web page.
<html>
<body>
    Login Successful
</body>
</html>


//检查会话是否未注册，重定向回主页。//把这个
网页第一行的代码。
登录成功

这是错误

警告：无法修改标题信息-标题已由第34行的/home/latabla1/public_html/MenuSemanal/checklogin.php:1）中的/home/latabla1/public_html/MenuSemanal/checklogin.php发送

与数据库的连接很好，因为当我输入错误的登录详细信息时，它会回显“错误的用户名或密码”；，我已经检查了空格，但是我找不到哪里不对劲

请帮忙，我已经花了整整一天的时间试图解决这个问题。

确保

checkLogin.php

没有存储为Unicode文件（其中包含前导字节顺序标记）

使用

标题时，必须没有数据发送到浏览器（如手册页所述）。
您是否尝试查看/home/latabla1/public\u html/MenuSemanal/checklogin.php
中第一行的内容？确保在之前没有空格，但看不到任何空格，我甚至用notepad.writeob_start（）
在checklogin.php的顶部打开并保存了这个文件，就在我尝试之后，我一直在第35行遇到同样的错误，但是谢谢。