//Validate numeric form controls:
if($uploadOk == 1){

    //Greycut:
    try{
        $greycut = (float) $_POST['greycut'];
        if($greycut < 0 || $greycut > 1){
            echo '<div class="alert alert-danger"><strong>Warning!</strong> Please refrain from changing form values with the element inspector.</div>';
            $uploadOk = 0;
        }else{
            $greycut = (string) $greycut;
        }
    }catch (Exception $ex){
        echo '<div class="alert alert-danger"><strong>Warning!</strong> Please refrain from changing form values with the element inspector.</div>';
        $uploadOk = 0;
    }

    //Temperature:
    try{
        $temperature = (float) $_POST['temperature'];
        if($temperature < 0.1 || $temperature > 10){
            echo '<div class="alert alert-danger"><strong>Warning!</strong> Please refrain from changing form values with the element inspector.</div>';
            $uploadOk = 0;
        }else{
            $temperature = (string) $temperature;
        }
    }catch (Exception $ex){
        echo '<div class="alert alert-danger"><strong>Warning!</strong> Please refrain from changing form values with the element inspector.</div>';
        $uploadOk = 0;
    }

    //Total Sweeps:
    try{
        $totalsweeps = (float) $_POST['totalsweeps'];
        if($totalsweeps < 1 || $totalsweeps > 10){
            echo '<div class="alert alert-danger"><strong>Warning!</strong> Please refrain from changing form values with the element inspector.</div>';
            $uploadOk = 0;
        }else{
            $totalsweeps = (string) $totalsweeps;
        }
    }catch (Exception $ex){
        echo '<div class="alert alert-danger"><strong>Warning!</strong> Please refrain from changing form values with the element inspector.</div>';
        $uploadOk = 0;
    }

}