ログイン/登録ページを作成しました。chromeとfirefoxでは正常に動作しますが、Internet Explorerでは動作しません（8、9）。送信ボタンをクリックした後、つまりインデックスページにリダイレクトします。このコードに基づく別のページでも同じ問題が発生します。
これがhtmlコードです：
<?php
$log_in=false;
$token_sent=0;
$errors1 = array();
$missing1 = array();
$errors = array();
$missing = array();
if(isset($_POST['submit'])){
$expected = array('login', 'email', 'pwd');
$required = array('login', 'email', 'pwd');
require('./rejestracja.inc.php');
}
if ($token_sent) {
header('Location: (..) ');
exit;
}
if(isset($_POST['submit1'])) {
$expected=array('login1','pwd1');
$required=array('login1','pwd1');
require('./login.inc.php');
if($log_in) {
if (isset($_SESSION['name']) && !empty($_SESSION['name'])) {
unset($_SESSION['login1']);
if (isset($_COOKIE[session_name()])) {
setcookie(session_name(), '', time()-86400, '/');
}
session_destroy();
}
if (isset($_POST['login1'])) {
session_start();
$_SESSION['name'] = $login1 ;
}
header('Location: http:// (...) ');
exit;
}
}
?>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN"
"http://www.w3.org/TR/html4/strict.dtd">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<title></title>
<meta name="description" content="">
<meta name="copyright" content="Copyright (c) 2012 k">
<meta name="author" content="">
<link href="style.css" rel="stylesheet" type="text/css" media="screen">
<link href="login.css" rel="stylesheet" type="text/css" media="screen">
</head>
<body>
<div id="wrap">
<?php include('./login_menu.inc.php');?>
<div id="header">
<h1></h1>
</div>
<?php include('./fb.inc.php');?>
<?php include('./menu.inc.php');?>
<?php include('./w_budowie.inc.php');?>
<div id='left'>
<div id='info'>
<h1 class='title'>LOGIN</h1> <br/>
<form class='form' name="login1" action=" " method="post">
<?php if ($missing1) { ?>
<span class="warning">...</span><br/>
<?php } ?>
<?php if(isset($errors1['wrong'])){ ?>
<span class="warning">...</span><br/>
<?php } ?>
<?php if(isset($errors1['not_verified'])){ ?>
<span class="warning">...</span><br/>
<?php } ?>
<label for="login1">Login: </label>
<input type="text" name="login1"
<?php if ($missing1 || $errors1) {
echo 'value="' . htmlentities($login1, ENT_COMPAT, 'UTF-8') . '"';
} ?>
/>
<br/>
<label for="pwd1">Password:</label>
<input type="password" name="pwd1" /> <br/>
<br/>
<span class='submit'><input name="submit1" type="submit" value="LOGIN" /></span>
</form>
<br/>
</div>
</div>
<div id='right'>
<div id='info'>
<h1 class='title'>REGISTRATION</h1> <br/>
<form class='form' name="register" action=" " method="post">
<label for="login">Login: </label>
<input type="text" name="login"
<?php if ($missing || $errors) {
echo 'value="' . htmlentities($login, ENT_COMPAT, 'UTF-8') . '"';
} ?>
/>
<?php if ($missing && in_array('login', $missing)) { ?>
<span class="warning">...</span>
<?php
} elseif(isset($errors['login_mini'])){ ?>
<span class="warning">...</span>
<?php
} elseif(isset($errors['login_maxi'])){ ?>
<span class="warning">...</span>
<?php
} elseif(isset($errors['login'])){ ?>
<span class="warning"> A-Z, a-z, 0-9.</span>
<?php
} elseif(isset($errors['login_exist'])){ ?>
<span class="warning">...</span>
<?php } ?>
<br/>
<label for="email">Email: </label>
<input type="text" name="email"
<?php if ($missing || $errors) {
echo 'value="' . htmlentities($email, ENT_COMPAT, 'UTF-8') . '"';
} ?>
/>
<?php if ($missing && in_array('email', $missing)) { ?>
<span class="warning">...</span>
<?php } elseif(isset($errors['email'])){ ?>
<span class="warning">...</span>
<?php } elseif(isset($errors['email_exist'])){ ?>
<span class="warning">...</span>
<?php } ?>
<br/>
<label for="pwd">Password:</label>
<input type="password" name="pwd" />
<?php if ($missing && in_array('pwd', $missing)) { ?>
<span class="warning">...</span>
<?php
} elseif(isset($errors['pwd_mini'])){ ?>
<span class="warning">...</span>
<?php
} elseif(isset($errors['pwd_maxi'])){ ?>
<span class="warning">...</span>
<?php } ?>
<br/>
<span class='submit'><input type="submit" name="submit" value="REGISTER" /></span>
</form>
<br/>
</div>
</div>
<?php include('./footer.inc.php'); ?>
</div>
</body>
</html>
'login.inc.php'コードは次のとおりです。
<?php
$login1 = "";
$pwd1 = "";
$salt = "(...)";
/*---------------con------------------------*/
include('./sql_connect.inc.php');
/*---------------------------------------------*/
foreach ($_POST as $key => $value) {
$temp = is_array($value) ? $value : trim($value);
if (empty($temp) && in_array($key, $required)) {
$missing1[] = $key;
} elseif (in_array($key, $expected)) {
${$key} = $temp;
}
}
if(!$missing1){
$login1 = mysql_real_escape_string($login1);
$hash = $salt . $pwd1;
for ( $i = 0; $i < 100; $i ++ ){
$hash = hash('sha256', $hash);
}
/*---------------COMPARE-----------------*/
$result = mysql_query("SELECT user_nick='$login1' FROM users WHERE user_password='$hash'") or die('Sorry, we could not count the number of results: ' . mysql_error());
if($result){
if(mysql_result($result, 0)){
/*-------IS ACTIVATED?------------------------------*/
$verified = mysql_query("SELECT user_verified='yes' FROM users WHERE user_nick='$login1'");
if($verified){
if(mysql_result($verified, 0)){
$log_in=true;
}else{
$errors1['not_verified'] = true;
}
}
}else{
$errors1['wrong'] = true;
}
}
}
mysql_close($con);
?>