Send values to db when multiple checkboxes are checked - php

Question

I am loading some data from a db table to checkboxes. When a user checks boxes and submits, the values from these checkboxes need to be added to a different table. With the code I have now, I am able to send values of one checked box. What am I missing in sending the values of all the checked checkboxes?
<table>
<?php
$q5=mysqli_query($link,"SELECT * FROM brands_offer WHERE Brand_Id='$bid' AND Published='1' ");
while($row5 = mysqli_fetch_array($q5)){
$catid= $row5['Catg_Id'];
$subcatid= $row5['Subcatg_Id'];
$pid= $row5['Product_Id'];
?><tr><td>
<form action="store-admin.php?search=<?php echo $stname;?>#stock" method="post">
<input type="checkbox" name="checkbox" value="<?php echo "$bname,$catid,$subcatid,$pid";?>" >
<?php
echo $bname;
echo " -> ";
echo $catid;
echo ", ";
echo $subcatid;
echo ", ";
echo $pid;
echo " ";
}
?></td></tr>
<input type="submit" value="Save Changes" name="add" >
</form>
</table>
<?php
if(isset($_POST['add']))
{
$chk = $_POST['checkbox'];
$val = explode(",",$chk);
$bn = $val[0];
$cid= $val[1];
$scid= $val[2];
$prid= $val[3];
echo "<script type='text/javascript'>alert('brand: ". $bn."')</script>";
echo "<script type='text/javascript'>alert('cat: ". $cid."')</script>";
echo "<script type='text/javascript'>alert('sub: ". $scid."')</script>";
echo "<script type='text/javascript'>alert('pr: ". $prid."')</script>";
}?>

Answer 1

Use brackets in your checkbox name attribute name="checkbox[]" and your post variable will be an array of selected values.
Edit: I noticed you have form opening tag inside the while loop. You need to put it before while loop otherwise its generating tons of opening form tags.

Answer 2

So it looks like you have only one checkbox. If you want to POST the values of all the checkboxes as an array I believe you need to add [] to the name of your input field. So:
<input type="checkbox" name="checkbox[]" value="<?php echo "$bname";?>"/>
<input type="checkbox" name="checkbox[]" value="<?php echo "$catid";?>"/>
<input type="checkbox" name="checkbox[]" value="<?php echo "$subcatid";?>"/>
<input type="checkbox" name="checkbox[]" value="<?php echo "$pid";?>"/>
Hopefully I understood your question.