整个脚本在我的localhost（wamp）中工作..但是当我尝试登录时显示一个空白页面（Web主机）..重定向正在工作..（当Ii输入无效的用户名/密码时，它会重定向到登录失败在成功登录时，它会重定向到myprofile.php） . 但页面myprofile.php显示为空白页面

这是我的登录PHPfile ..

<?php
    ob_start();
    session_start();
    if(count($_POST)>0) 
    {
        include('config.php');
        $result = mysql_query("SELECT * FROM members WHERE username='" . $_POST["username"] . "' and password = '". $_POST["password"]."'");
        $row  = mysql_fetch_array($result);
        if(isset($_SESSION['logged'])) 
        {
        header('Location:Member/myprofile.php');
        }
        if(is_array($row)) 
        {
            $_SESSION["id"] = $row['ID'];
            $_SESSION["username"] = $row['username'];
            $_SESSION["password"] = $row['password'];
            $_SESSION["mname"] = $row['mname'];
            $_SESSION["fname"] = $row['fname'];
            date_default_timezone_set("Asia/Calcutta");
            $lastlog=date("d/m/Y");
            $logtime=date("h:i a");
            $query = "UPDATE `members` SET `lastlogin`='$lastlog',`logintime`='$logtime' WHERE `ID`='$row[ID]'"; 
            mysql_query($query);
            $_SESSION['logged']='TRUE'; 
        } 
        else 
        {
            echo "<SCRIPT>
            alert('Wrong Username/Password or Awaiting Approval');
            </SCRIPT>";
            header("Location:login_failed.html");
        }
    }
    if(isset($_SESSION["id"])) {
    header("Location:Member/myprofile.php");
    }
    ob_end_flush();
    ?>

这里有一些myprofile.php

<!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" xml:lang="en" lang="en">
    <?php
    session_start();
    include('config.php');
    $row = $mysqli->query("SELECT * FROM members WHERE username='" . $_SESSION ["username"] . "'")->fetch_array();
    date_default_timezone_set("Asia/Calcutta");
    $row1 = $mysqli->query("SELECT * FROM images WHERE userid='". $_SESSION ["id"]."'")->fetch_array();
    ?>
    <head>
        <meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />
        <title>Home | My Home</title>

任何帮助..我是新来的..

php redirect header location