9

here is the code i have written

index.php:

  <?php session_start(); 
header("Expires: Mon, 26 Jul 1997 05:00:00 GMT");
header("Cache-Control: no-cache");
header("Pragma: no-cache");
?>
<!DOCTYPE html>
<html>
<head>
    <title>Student-login</title>
    <link href='http://fonts.googleapis.com/css?family=Shadows+Into+Light' rel='stylesheet' type='text/css'>
    <link rel="stylesheet" type="text/css" href="css/main.css">
    <link rel="stylesheet" type="text/css" href="css/font-awesome.min.css">
    <link rel="shortcut icon" href="css/favicon.jpg"/>
    <link href='http://fonts.googleapis.com/css?family=Questrial' rel='stylesheet' type='text/css'>
</head>
<body>
    <div class="bodybg"></div>
    <div class="main-form">
        <h1>Student Login</h1>
        <form class="login" action="database.php" method="post">
            <input type="text" placeholder="&#xf007; User name(*)" name="username" required></input><br>
            <input type="password" placeholder="&#xf023; Password(*)" name="password" required>
        </input><br>
        <input type="submit" value="Login" name="btnlogin"></input><br>
        <div class="button"><a href="login.php">Register</a></div>

        <!--flash message-->
        <div id="message">
            <?php 
            if(isset($_SESSION['success'])){
                echo $_SESSION['success'];
                //echo "<p class='message'>hello this world!!</p>";

            }else{
                echo " ";
            }
            $_SESSION['success']=' ';
            ?>
        </div>
    </form>
</div>
<div id="heading">
    <p id="p1">American Internation University-Bangladesh</p>
    <p id="p2">Thesis Compilation</p>
</div>
<div id="content">
    <div id="prev"><i class="fa fa-chevron-left fa-1x"></i></div>
    <div id="next" d><i class="fa fa-chevron-right fa-1x"></i></div>
    <div id="pager"></div>
    <div id="slider">
        <div class="item">
            <img src="img/1.jpg">
            <div class="info">
                <h2>Picture 1</h2>
                <p>This is the library</p>
            </div>
        </div>
        <div class="item">
            <img src="img/2.jpg">
            <div class="info">
                <h2>Picture 2</h2>
                <p>This is the Book</p>
            </div>
        </div>
        <div class="item">
            <img src="img/3.jpg">
            <div class="info">
                <h2>Picture 3</h2>
                <p>This is the Pen</p>
            </div>
        </div>
        <div class="item">
            <img src="img/4.jpg">
            <div class="info">
                <h2>Picture 4</h2>
                <p>This is the literature</p>
            </div>
        </div>
        <div class="item">
            <img src="img/5.jpg">
            <div class="info">
                <h2>Picture 5</h2>
                <p>This is the Research</p>
            </div>
        </div>
    </div>  
</div>
<script type="text/javascript" src="js/jquery.js"></script>
<script type="text/javascript" src="js/cycle.js"></script>
<script type="text/javascript" src="js/main.js"></script>
</body>
</html>

and home.php:

 <?php 
session_start(); 
header("Expires: Mon, 26 Jul 1997 05:00:00 GMT");
header("Cache-Control: no-cache");
header("Pragma: no-cache");
?>
<!DOCTYPE html>
<html>
<head>
    <title>Home</title>
    <link href='http://fonts.googleapis.com/css?family=Shadows+Into+Light' rel='stylesheet'
    type='text/css'>
    <link rel="stylesheet" type="text/css" href="css/main.css">
    <link rel="stylesheet" type="text/css" href="css/font-awesome.min.css">
    <link rel="shortcut icon" href="css/favicon.jpg"/>
</head>
<body class="body"> 

    <div class="menu">
        <div class="home">
            <a href="Home.html">Home</a>
        </div>
        <div class="profile">
            <a href="profile.html">Profile</a>
        </div>
        <div class="contact">
            <a href="contact.html">Contact</a>
        </div>
        <div class="logout">
            <a href="database.php?laction">Logout</a>
        </div>
    </div>
    <div class="transparent">
    </div>
    <div class="content">
        <div id="message">
            <?php 
            if(isset($_SESSION['success'])){
                echo $_SESSION['success'];
                //echo "<p class='message'>hello this world!!</p>";

            }else{
                echo " ";
            }
            $_SESSION['success']=' ';
            ?>
        </div>
    </div>
    <script type="text/javascript" src="js/jquery.js"></script>
    <script type="text/javascript" src="js/main.js"></script>
</body>
</html>

and the problem is this should have prevent the cache in the browser through header() function but after loading the page the back button is taking me to the previous page and the forward button of the browser is taking me to the next page can any one help how to prevent this browser cache or why is my code here is not working?

Ethereal soul
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    The caching options don't control the forward/back buttons, they only affect what happens when the user navigates to the URL. – Barmar Jul 30 '15 at 22:56
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    didn't get your point ..can you please describe a bit elaborately?because even if i navigated to the previous url it is showing the page but it shouldnt do that right?@Barmar – Ethereal soul Jul 30 '15 at 22:58
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    The back and forward buttons just redisplay the page as it was already rendered, they don't reload the page. They don't use the web cache, so the command that disable caching have no effect on them. – Barmar Jul 30 '15 at 22:59
  • @Etherealsoul, take a look at this: https://github.com/browserstate/history.js/ – Matt Komarnicki Jul 30 '15 at 23:09

1 Answers1

25

Thanks guys for helping me out but i found a way that force the browser to prevent cache and i have used the below code :

header("Cache-Control: no-cache, no-store, must-revalidate"); // HTTP 1.1.
header("Pragma: no-cache"); // HTTP 1.0.
header("Expires: 0 "); // Proxies.

here is the reference : Making sure a web page is not cached, across all browsers and its working pretty good.

Community
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Ethereal soul
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