Execute php script when checkbox checked

I wanted to do that when my checkbox is checked, a php script whill be executed. There is my code :

<form action="checkboxes.php" method="post">
<input type="checkbox" value="dawid" name="chk1"> 4K </input>
<input type="submit" name="Submit" value="Submit"></input>
</form>

<?php
                        
                        $bdd=new PDO("mysql:host=localhost;dbname=techtronik.pl;charset=utf8", "root");
                        $wyszukiwanie = $bdd->query("SELECT * FROM procesory ");
                        while($wynik = $wyszukiwanie->fetch() )
                        {
                                echo $wynik ['nazwaproduktu'] . ". ";
                        }
                        
?>   

Can someone please help me ? Thanks.