Empty posts when refresh page [ Double Submission ] ( PHP/MYSQL ) - php

Question

Im new in MYSQL & PHP so don't mind me about my stolen code XD
I want to publish simple posts by using PHP/HTML & saving on Database.
Ayway here is the file that i've created to post stuff on home.php
admin.php
<?php
$servername = "localhost";
$username = "root";
$password = "";
$dbname = "dblogin";
$newsTitle = null;
$newsShortDescription = null;
$newsFullContent = null;
$newsColor = null;
$newsIcon = null;
$users_website = null;
$users_comment = null;
if(isset($_POST['btn-post']))
{
$newsTitle = $_POST['news_title'];
$newsShortDescription = $_POST['news_short_description'];
$newsFullContent = $_POST['news_full_content'];
$newsColor = $_POST['news_color'];
$newsIcon = $_POST['news_author'];
}
$newsTitle = mysql_real_escape_string($newsTitle);
$newsShortDescription = mysql_real_escape_string($newsShortDescription);
$users_website = mysql_real_escape_string($users_website);
$users_comment = mysql_real_escape_string($users_comment);
$conn = new PDO("mysql:host=$servername;dbname=$dbname", $username, $password);
// set the PDO error mode to exception
$conn->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);
$sql = "INSERT INTO info_news (news_title, news_short_description, news_full_content, news_author, news_color)
VALUES ('$newsTitle', '$newsShortDescription', '$newsFullContent', '$newsIcon', '$newsColor')";
// use exec() because no results are returned
$conn->exec($sql);
echo "New record created successfully";
$conn = null;
?>
<form method="post">
<div class="form-group">
<input type="text" class="form-control" name="news_title" placeholder="Title" required />
</div>
<div class="form-group">
<input type="text" class="form-control" name="news_short_description" placeholder="Description" required />
</div>
<div class="form-group">
<input type="text" class="form-control" name="news_full_content" placeholder="Full Content" required />
</div>
<div class="form-group">
<input type="text" class="form-control" name="news_color" placeholder="Color" required />
</div>
<div class="form-group">
<input type="text" class="form-control" name="news_author" placeholder="Icon" required />
</div>
<div class="clearfix"></div>
<div class="form-group">
<button type="submit" name="btn-post" class="btn btn-block btn-primary">
Post
</button>
</div>
<br />
</form>
Thank you :)
I want to make kind of a simple blog, only Title, Short Description and so... It works while i make new posts, but when i refresh it shows an empty post. Here is a pic: Here is the Image also i've tried to edit the admin.php ( By looking other questions on SOF )
<?php
$servername = "localhost";
$username = "root";
$password = "";
$dbname = "dblogin";
$conn = new PDO("mysql:host=$servername;dbname=$dbname", $username, $password);
$conn->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);
$stmt = $conn->prepare("INSERT INTO info_news (news_title, news_short_description, news_full_content, news_author, news_color) VALUES (:news_title, :news_short_description, :news_full_content, :news_author, :news_color)");
$stmt->bindParam(':news_title', $news_title);
$stmt->bindParam(':news_short_description', $news_short_description);
$stmt->bindParam(':news_full_content', $news_full_content);
$stmt->bindParam(':news_author', $news_author);
$stmt->bindParam(':news_color', $news_color);
$stmt->execute($_POST);
?>
<form method="post">
<div class="form-group">
<input type="text" class="form-control" name="news_title" placeholder="Title" required />
</div>
<div class="form-group">
<input type="text" class="form-control" name="news_short_description" placeholder="Description" required />
</div>
<div class="form-group">
<input type="text" class="form-control" name="news_full_content" placeholder="Full Content" required />
</div>
<div class="form-group">
<input type="text" class="form-control" name="news_color" placeholder="Color" required />
</div>
<div class="form-group">
<input type="text" class="form-control" name="news_author" placeholder="Icon" required />
</div>
<div class="clearfix"></div>
<div class="form-group">
<button type="submit" name="btn-post" class="btn btn-block btn-primary">
Post
</button>
</div>
<br />
</form>
By looking some other questions on stackoverflow but still no luck ;/

Answer 1

it's not an empty post what makes the empty row inserted, try this:
if(isset($_POST['btn-post']))
{
$newsTitle = $_POST['news_title'];
$newsShortDescription = $_POST['news_short_description'];
$newsFullContent = $_POST['news_full_content'];
$newsColor = $_POST['news_color'];
$newsIcon = $_POST['news_author'];
$newsTitle = mysql_real_escape_string($newsTitle);
$newsShortDescription = mysql_real_escape_string($newsShortDescription);
$users_website = mysql_real_escape_string($users_website);
$users_comment = mysql_real_escape_string($users_comment);
$conn = new PDO("mysql:host=$servername;dbname=$dbname", $username, $password);
// set the PDO error mode to exception
$conn->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);
$sql = "INSERT INTO info_news (news_title, news_short_description, news_full_content, news_author, news_color)
VALUES ('$newsTitle', '$newsShortDescription', '$newsFullContent', '$newsIcon', '$newsColor')";
// use exec() because no results are returned
$conn->exec($sql);
echo "New record created successfully";
$conn = null;
}
I moved the "}" after $conn = null; ;)
And BTW, you should redirect after each POST. So POST is not sent once more on page refresh.
And you can't redirect while the content was "echoed" already. It will work for a while thanks to buffer, but when the header will grow in its size (like 4kB, depends on server settings) it will fail one day. (saw it few times in github you posted)