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私は、データベースに格納されたデータでログイン資格情報をチェックするためのユーザログインページとPHPスクリプトを持っています。すべてうまくいきました。私はちょうど、ログインの詳細がデータベースのデータと一致せず、自動的にログインページに戻るなら、 "間違ったメール"のテキストを含むCSSスタイルのmsgボックスを追加しようとしました。PHPは間違ったログインの詳細を返す（div）
残念ながら、MSGはエコーされていない、ログインページに戻ってます。..
私のPHPコードはこのように書きます。..
<style>
.alert {
padding: 20px;
background-color: #f44336;
color: white;
}
.closebtn {
margin-left: 15px;
color: white;
font-weight: bold;
float: right;
font-size: 22px;
line-height: 20px;
cursor: pointer;
transition: 0.3s;
}
.closebtn:hover {
color: black;
}
</style
<?php
//15 2 2015
session_start();
$Cser = mysqli_connect("localhost","root","*****","database") or die("Server connection failed : ".mysqli_error($Cser));
$email = $_REQUEST["email"];
$password = $_REQUEST["password"];
$s = "select * from fuser where email='".$email."' and password = '".$password."'";
$result = mysqli_query($Cser,$s);
$count = mysqli_num_rows($result);
if($count>0)
{
$_SESSION["username"] = $username;
$_SESSION["login"]="1";
header("location:../home.php");
}
else
{
echo '<div class="alert">';
echo '<span class="closebtn" onclick="this.parentElement.style.display="none";">×</span>';
echo '<strong>Danger!</strong> wrong email id';
echo '</div>';
header("location:sign.php");
}
?>
マイsign.phpコード次のように::
任意の助けを大幅に高く評価され<!DOCTYPE html>
<html >
<?php
$servername = "localhost";
$username = "root";
$password = "*******";
$dbname = "database";
$conn = new mysqli($servername, $username, $password, $dbname);
?>
<head>
<meta charset="UTF-8">
<title>title</title>
<script src="http://s.codepen.io/assets/libs/modernizr.js" type="text/javascript"></script>
<link href='http://fonts.googleapis.com/css?family=PT+Sans:400,700' rel='stylesheet' type='text/css'>
<link rel="stylesheet" href="https://s3-us-west-2.amazonaws.com/s.cdpn.io/148866/reset.css">
<link rel="stylesheet" href="css/reset.css">
<link rel="stylesheet" href="css/style.css">
</head>
<body>
<header role="banner">
<nav class="main-nav">
<ul>
<!-- inser more links here -->
<li><a class="cd-signin" href="#0">Sign In</a></li>
<li><a class="cd-signup" href="#0">Sign Up</a></li>
</ul>
</nav>
</header>
<label class="thought">
<p> find your passion, <br><br> make it as your profession </p>
</label>
<div class="cd-user-modal"> <!-- this is the entire modal form, including the background -->
<div class="cd-user-modal-container"> <!-- this is the container wrapper -->
<ul class="cd-switcher">
<li><a href="#0">Sign In</a></li>
<li><a href="#0">Sign Up</a></li>
</ul>
<div id="cd-login"> <!-- log in form -->
<form class="cd-form" action="logincheck.php" method="post">
<p class="fieldset">
<label class="image-replace cd-email" for="signin-email">E-mail</label>
<input class="full-width has-padding has-border" name="email" id="signin-email" type="text" placeholder="E-mail" required autocomplete="off">
<span class="cd-error-message">Error message here!</span>
</p>
<p class="fieldset">
<label class="image-replace cd-password" for="signin-password">Password</label>
<input class="full-width has-padding has-border" name="password" id="signin-password" type="text" placeholder="Password" required autocomplete="off">
<a href="#0" class="hide-password">Hide</a>
<span class="cd-error-message">Error message here!</span>
</p>
<p class="fieldset">
<input type="checkbox" id="remember-me">
<label for="remember-me">Remember me</label>
</p>
<button class="button button-block" type="submit" > Sign In </button>
</form>
<p class="cd-form-bottom-message"><a href="#0">Forgot your password?</a></p>
<!-- <a href="#0" class="cd-close-form">Close</a> -->
</div> <!-- cd-login -->
<div id="cd-signup"> <!-- sign up form -->
<form class="cd-form" action="register.php" method="post" >
<p class="fieldset">
<label class="image-replace cd-username" for="signup-username">Profile Name</label>
<input class="full-width has-padding has-border" name="name" id="signup-username" type="text" placeholder="Type your Name" required autocomplete="off">
<span class="cd-error-message">Error message here!</span>
</p>
<p class="fieldset">
<label class="image-replace cd-email" for="signup-email">E-mail</label>
<input class="full-width has-padding has-border" name="email" id="email" type="text" placeholder="[email protected]"required autocomplete="off" onkeyup="checkemail();">
<span class="cd-error-message" id="result"></span>
</p>
<label id="title" class="dropdown"><font face="verdana"> Select any three streams that your skills suits the best: </font><br><br>
<select id="job" name="category1" required>
<option value="Engineering"><font face="verdana">Engineering</font></option>
<option value="Medical"><font face="verdana">Medical</font></option>
<option value="Programming"><font face="verdana">Programming</font></option>
<option value="Business"><font face="verdana">Business</font></option>
<option value="Admin"><font face="verdana">Admin</font></option>
<option value="Other"><font face="verdana">Other</font></option>
</select>
<select id="job" name="category2" required>
<option value="Engineering"><font face="verdana">Engineering</font></option>
<option value="Medical"><font face="verdana">Medical</font></option>
<option value="Programming"><font face="verdana">Programming</font></option>
<option value="Business"><font face="verdana">Business</font></option>
<option value="Admin"><font face="verdana">Admin</font></option>
<option value="Other"><font face="verdana">Other</font></option>
</select>
<select id="job" name="category3" required>
<option value="Engineering"><font face="verdana">Engineering</font></option>
<option value="Medical"><font face="verdana">Medical</font></option>
<option value="Programming"><font face="verdana">Programming</font></option>
<option value="Business"><font face="verdana">Business</font></option>
<option value="Admin"><font face="verdana">Admin</font></option>
<option value="Other"><font face="verdana">Other</font></option>
</select>
</label>
<p class="fieldset">
<label class="image-replace cd-password" for="signup-password">Password</label>
<input class="full-width has-padding has-border" name="password" id="signup-password" type="text" placeholder="Password" required autocomplete="off">
<a href="#0" class="hide-password">Hide</a>
<span class="cd-error-message">Error message here!</span>
</p>
<p class="fieldset">
<input type="checkbox" id="accept-terms" required>
<label for="accept-terms">I agree to the <a href="#">Terms</a></label>
</p>
<button class="button button-block" type="submit" > Create an Account </button>
</form>
<!-- <a href="#0" class="cd-close-form">Close</a> -->
</div> <!-- cd-signup -->
<div id="cd-reset-password"> <!-- reset password form -->
<p class="cd-form-message">Lost your password? Please enter your email address. You will receive a link to create a new password.</p>
<form class="cd-form">
<p class="fieldset">
<label class="image-replace cd-email" for="reset-email">E-mail</label>
<input class="full-width has-padding has-border" id="reset-email" type="email" placeholder="E-mail" autocomplete="off" required>
<span class="cd-error-message">Error message here!</span>
</p>
<p class="fieldset">
<input class="full-width has-padding" type="submit" value="Reset password">
</p>
</form>
<p class="cd-form-bottom-message"><a href="#">Back to log-in</a></p>
</div> <!-- cd-reset-password -->
<a href="#" class="cd-close-form">Close</a>
</div> <!-- cd-user-modal-container -->
</div> <!-- cd-user-modal -->
<script src='http://cdnjs.cloudflare.com/ajax/libs/jquery/2.1.3/jquery.min.js'></script>
<script src="js/index.js"></script>
</body>
</html>
..
にプレーンテキストでパスワードを保存しないでくださいを。 [それらをハッシュ]（http://php.net/password_hash）。 – Mike
.......... – harishk
正確な重複はありませんが、http://stackoverflow.com/questions/8028957/how-to-fix-headers-already-sent-error-in-php/ 8028979＃8028979 – Mike