We will use php header redirection to post back the values to our main page where checkbox is present. We will call form page as first page and action or submitted page as second page. The form data will be received by second page and after validation it is supposed to complete all the processing and in case of error it will post back the form data back to form page by using query string through address bar.
We will use the example of two checkbox but same system can be extended to more than two or single checkbox in a form.
Here is the code of a form with two checkboxes
echo "<form method=post action=pb-chk.php>
<input type=checkbox name=t1 value=yes $t1v> This is first checkbox<br>
<input type=checkbox name=t2 value=yes $t2v> This is second checkbox
<input type=submit value=Submit>";
To keep the second page simple we will keep only the redirection part. Here we have excluded the part which takes care if the form passes its validation and execute the actual script.
Inside the file pb-chk.php we receive the data using POST method and create the query string. ( GET method is used to receive data in Form page or pb-check.php page )
Here is the code of second page, pb-chk.php
$t1=$_POST['t1']; // receive form ( checkbox value) data using POST method
header ("Location: pb-check.php?t1=$t1&t2=$t2"); // redirect to First page or Form page