Question

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>

Answer 1

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();
}