如何在多个选中的复选框上运行查询？

I have multiple checkboxes (don't know how much, will print dynamically). I am using the following code to check how much boxes are selected.

<form action="#" method="post">
<input type="checkbox" name="check_list[]" value="C/C++"><label>C/C++</label><br/>
<input type="checkbox" name="check_list[]" value="Java"><label>Java</label><br/>
<input type="checkbox" name="check_list[]" value="PHP"><label>PHP</label><br/>
<input type="submit" name="submit" value="Submit"/>
</form>



<?php
    include ("include/connection.php");

if(isset($_POST['submit']))
{
    if(!empty($_POST['check_list']))
    {
        foreach($_POST['check_list'] as $selected)
        {

            $query = mysqli_query($db, "INSERT INTO table (field) VALUES ('$selected')");

            if($query)
            {
                echo "Query done for ". $selected . "<br>";
            }
            else
            {
                echo "problem". mysqli_error();
            }

        }
    }
}
?>

Now the question is I want to run a query on each one by one. How can I do it in PHP? using while loop, for loop or anyother method?