every time i am refreshing the page and i am getting the same value stored in the post array. i want execution of echo statement only after submit and after refreshing no echo results..
<?php if(isset($_POST['submit'])) { $name = $_POST['name']; echo "User name : <b> $name </b>"; } ?> <form method="post" action="<?php echo $_SERVER['PHP_SELF']; ?>"> <input type="text" name="name"><br> <input type="submit" name="submit" value="Submit Form"><br> </form> From just a form, you won't be able to check if it was a refresh, or a first submit, regardless of using GET or POST method.
To ensure a single message, you need to:
a. redirect the user to somewhere else after you processed the request.
if(isset($_POST['submit'])) { // process data header("Location: new-url"); } And display the message on the other URL.
b. set a cookie / session variable, which tells you the form was already processed.
if(isset($_POST['submit']) && !isset($_SESSION['form_processed'])) { $_SESSION['form_processed'] = true; } This second approach will kill your form until the user closes the browser, so you should do something more complex - like storing another hidden field in the form, and storing that in the session.
If you submit a form and then refresh the resulting page, the browser will re-post the form (usually prompts first). That is why the POST data is always present.
An option would be to store a session variable and have it sent in the form, then check if it matches in the form processing code - to determine if it is a re-post or not.
Within the form:
<input type="hidden" name="time" value="<?php echo $time; ?>" /> In the PHP:
session_start(); if(isset($_POST['submit'])) { if(isset($_SESSION['time']) && $_SESSION['time'] == $_POST['time']) { echo "User name : <b> $name </b>"; } } $time = $_SESSION['time'] = time(); Another option is to redirect after processing the post data:
if(isset($_POST['submit'])) { ... ... header('Location: ' . basename($_SERVER['PHP_SELF'])); exit(); } 
isset() to prevent the Notice. The session option is better than the redirect because you can't print anything before a redirect.You need to maintain a state as to whether $name has already been displayed or not. The easiest way is probably to maintain that state in a browser cookie.
<?php $nonce = $_COOKIE['nonce']; $new_nonce = mt_rand(); setcookie('nonce', $new_nonce); if(isset($_POST['submit']) && $_POST['nonce'] == $nonce) { $name = $_POST['name']; echo "User name : <b> $name </b>"; } ?> <form method="post" action="<?php echo $_SERVER['PHP_SELF']; ?>"> <input type="hidden" name="nonce" value="<?php echo $new_nonce ?>"> <input type="text" name="name"><br> <input type="submit" name="submit" value="Submit Form"><br> </form> nonce cookie into an array of nonces, and update it accordingly.if you want refresh page after submit use
<form method="get" sure if your form hasn't a lot of data and also need to use $_GET instead of $_POST variable:) correct way for you, but this logic is not good, need to refactor this script:
<?php if(isset($_POST['submit'])) { $name = $_POST['name']; echo "User name : <b> $name </b>"; unset($_POST['submit']); } ?> <form method="post" action="<?php echo $_SERVER['PHP_SELF']; ?>"> <input type="text" name="name"><br> <input type="submit" name="submit" value="Submit Form"><br> </form> 