php form writing to text file - prevent POST redirect re-submission
Question
The code below is a php form that writes to a txt file and outputs the results on the same page.
However when I refresh the page POST data is automatically added again - and I want to prevent this. I understand I should redirect users to another page, but how do I do that if my results are on the same page and I want them to stay on the same page:
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<title>Score Watch</title>
</head>
<body>
<p>
<form id="form1" name="form1" method="post" action="">
<label>Date:
<input name="date" class="datepicker" id="date" required type="text"
data-hint="" value="<?php echo date('d/m/Y'); ?>" />
</label>
<br>
<label>Score:
<input type="text" name="name" id="name" />
</label>
<label>
<input type="submit" name="submit" id="submit" value="Submit" />
</label>
</form>
</p>
<?php
$date = $_POST["date"];
$name = $_POST["name"];
$posts = file_get_contents("posts.txt");
$posts = "$date $name<br>" . $posts;
file_put_contents("posts.txt", $posts);
echo $posts;
?>
</body>
</html>
I've seen the header('Location') tactic, but I can't use it since i output data on the same page?
2 answers
solution1
3 ACCPTED 2014-01-24 14:10:02
ADD THIS TO TOP OF YOU PAGE
<?php
if(isset($_POST['name'],$_POST['date'])){
// Text we want to add
$posts = "{$_POST['date']} {$_POST['name']}<br>";
// Add data to top of the file
file_put_contents("posts.txt", $posts . file_get_contents('posts.txt') );
// Redirect user to same page
header('Location: ' . $_SERVER['REQUEST_URI']);
}
?>
Change your body a little bit Replace this:
<?php
$date = $_POST["date"];
$name = $_POST["name"];
$posts = file_get_contents("posts.txt");
$posts = "$date $name<br>" . $posts;
file_put_contents("posts.txt", $posts);
echo $posts;
?>
with this:
<?php
// Print contents of posts.txt
echo file_get_contents("posts.txt");
?>
solution2
1 2014-01-24 14:09:02
You can use the same page, if you don't want to use another page. The data should be transmitted either via GET or SESSION
To prevent cyclic redirection, you should put in condition your redirection.
I would suggest:
At the top of the page
<?php session_start(); ?>
then
<?php
if (isset($_POST['date'])) {
$date = $_POST["date"];
$name = $_POST["name"];
$posts = file_get_contents("posts.txt");
$posts = "$date $name<br>" . $posts;
file_put_contents("posts.txt", $posts);
$_SESSION['posts'] = $posts;
header("Location: samepage.php?success=1");
}
?>
<?php
if (isset($_GET['success'], $_SESSION['posts'])) {
echo $_SESSION['posts']
}
?>
The redirection also should be before the HTML, to prevent sent headers issue.
Only the last block can be printed inside the <p> 's because it's actual output.
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