PHP separate id for every div - php

Question

to be honest this is more of a how to then help with code i already have. So i hope this is okay, else of course i will delete my question again. Anyway here goes i have a site with boxes, with a picture headline and a submit button. All the info in these boxes is being delivered, from my database. And of course in my database i also have a id cell, and if i try to echo out the id cell with the rest of the info in the box it shows up fine. But when i try to assign the id output variable to a header location, i do for some weird reason always get the id 3. Eventhough the id´s shows up perfectly fine, in the boxes. I have included my php code and i am still a beginner to php so sorry for this noob question. :)
session_start();
include 'connection.php';
$sqlSelect = mysqli_query($con,"SELECT * FROM inspi");
while ($feed=mysqli_fetch_array($sqlSelect))
{
$id = $feed['id'];
if(isset($_POST['readArticle']))
{
$id = $_SESSION['id'];
header("Location:"."redirect.php?".SID.$idArticle);
}
?>
<div class="contentBoxOne">
<img width="100%" height="170px" src="userpics/<?php echo $feed['image']; ?>">
<div class="line"></div>
<form method="post" action="">
<input type="submit" name="readArticle" class="readArticle" value="Læs nu!">
</form>
<?php $idArticle= $feed['id'];?>
<h2><?php echo $feed['headline'];?></h2>
</div>

Answer 1

You are setting $idArticle at the bottom of the loop but trying to use it at the top so it will be pulling it from the previous result. Try:
while ($feed=mysqli_fetch_assoc($sqlSelect)){
$idArticle= $feed['id'];
$sid = $_SESSION['id'];
if(isset($_POST['readArticle']))
{
header("Location:"."redirect.php?".$sid.$idArticle);
}
//rest of code
}

Answer 2

You will have to put div inside the loop.
I also replaced the header redirect with form action attribute (you may want to replace method POST with GET instead).
ID is passed with a hidden field
<?php
include 'connection.php';
$sqlSelect = mysqli_query($con,"SELECT * FROM inspi");
while ($feed=mysqli_fetch_assoc($sqlSelect))
{
$id = (int)$feed['id'];
?>
<div class="contentBoxOne">
<img width="100%" height="170px" src="userpics/<?php echo $feed['image']; ?>">
<div class="line"></div>
<form method="post" action="redirect.php">
<input type="hidden" name="id" value="<?php echo $id; ?>">
<input type="submit" name="readArticle" class="readArticle" value="Læs nu!">
</form>
<h2><?php echo $feed['headline']; ?></h2>
debug: <pre><?php print_r($feed); ?></pre>
</div>
<?php } // end of while loop ?>