Something

<?php
        $myList =  array(1,2,3,4,5);
 	$myM = 10;
	$lowerLimit = 20;

        function mult($list, $m) {
                $list = array_values($list);
                for ($i = 0; $i < count($list); ++$i) {
                         $list[$i] *= $m;
                }
                return $list;
        }
 
        $myList = mult($myList, $myM);
    
        echo implode(",",$myList);
?> 

<form action="/test/hahahoho.php" method="post">
	Lower Limit:  <input type="text" name="hehe" value="<?php echo ("$lowerLimit"); ?>" maxlength="40" /><br />
	<input type="submit" name="command" value="go"/>
</form>