Whats shall a page contain to make a form working

openside("");
echo openform("opret_aktivitet","POST",FUSION_SELF."?section=ny_aktivitet",array("class" => "m-t-20"));
   echo "<div class='row'>\n";
   echo "<div class='col-xs-12 col-sm-8'>\n";
echo form_hidden("func","opret");
echo form_text("navn",utf8_encode("AKTIVITET"),"",array(
    'placeholder' => utf8_encode('Angiv navn pÃ¥ aktivitet'),
   'required' => TRUE,
    'width' => '250px',
   'max_length' => 200,
   'error_text' => 'Skal udfyldes',
    "inline" => TRUE
));
   echo form_text('url', utf8_encode("LINK"), "", array(
      "type" => "url",
      "placeholder" => "http://",
      "required" => TRUE,
      "inline" => TRUE
   ));
   echo "</div>\n";
   echo "<div class='col-xs-12 col-sm-4'>\n";
       openside("ELEMENTER");
echo form_checkbox("kategori", utf8_encode("KATEGORI"));
echo form_checkbox("menu", utf8_encode("MENU"));
echo form_checkbox("kontakt", utf8_encode("KONTAKTFORMULAR"),0);
closeside();
echo "</div>\n</div>\n";
echo form_button('opret_aktivitet',"GEM","GEM", array('class' => 'btn-primary m-t-10'));
echo closeform();

<?php
/**
 * PHPFusion Infusion Development Tutorial
 * Should you have any questions regarding this tutorial, please forward your concerns in the forum.
 * Please state the line numbers of this gist code when discussing about this tutorial.
 * Provided by MT, PHPFusion.co.uk
 * 
 * Please follow the steps 1 to 4 when you practise coding. 
 * Notes are written as to why it is as such. 
 * Some original codes were altered to show common alternatives.
 */


// STEP 1, init blank values for all your fields
//(1) , point where data value is blank to be passed to form
$data = array(
  "func" => "",
  "navn" => "",
  "url" => "",
  "kategori" => "",
  "menu" => "",
  "kontakt" => "",
);

// STEP 2, do what happens if edit or delete... ?
/*
 * Edit URL: http://www.site.com/infusions/script_infusion/script.php?action=edit&item_id=1
 * Delete URL : http://www.site.com/infusions/script_infusion/script.php?action=del&item_id=1
 */
$edit = false;
if (isset($_GET['action'])) {
    switch($_GET['action']) {
        case "edit":
            if (isset($_GET['item_id']) && isnum($_GET['item_id'])) {
                // (2) point where blank $data is now filled with values from SQL Table.
                $data = dbarray(dbquery("SELECT * FROM ..."));
                $edit = true;
            } else {
                addNotice("danger", "Invalid Item ID");
                redirect(FUSION_REQUEST);
            }
        break;
        case "del":
            if (isset($_GET['item_id']) && isnum($_GET['item_id'])) {
                if (dbcount("(some_id)", SOME_DB, "some_id=''")) { // valid id and delete
                    dbquery("DELETE FROM .....");
                    addNotice("success", "Item deleted");
                } else {
                    addNotice("danger", "Invalid Item ID");
                    redirect(FUSION_REQUEST);
                }
            } else {
                addNotice("danger", "Invalid Item ID");
                redirect(FUSION_REQUEST);
            }
        break;
    }
}

// Step 4,  Finally do what happens button is executed a step before openform() to read previous form settings session variables. 
if (isset($_POST['opret_aktivitet'])) {
    // This is the question how to validate in Php-Fusion 9
    // Answer is like this, run form_sanitizer for everything..
    $data = array(
        "func" => form_sanitizer($_POST['func'], "", "func"), // post value, default value, input_name
        "navn" => form_sanitizer($_POST['navn'], "", "navn"),
        "url" => form_sanitizer($_POST['url'], "", "url"),
        "kategori" => form_sanitizer($_POST['kategori'], "", "kategori"),
        "menu" => form_sanitizer($_POST['menu'], "", "menu"),
        "kontakt" => isset($_POST['kontakt']) ? 1 : 0, // if validation not needed, just do like this fastest result
    );

    // Use this to stop Insertion/Update to push $data downwards without refresh to see errors on input
    if (\defender::safe()) {
       if ($edit == true) {
           dbquery_insert(DB_SOMETHING, $data, "update");
       } else {
           dbquery_insert(DB_SOMETHING, $data, "save");
       }
        redirect(FUSION_REQUEST); // Please refresh the page to reload page for new token for the form & security reason
    }
}


// STEP 3, draw form and assign $data value from either (1) or (2)
openside("");

// Minor adjustments - since you need &section, also you need to remember if there is &action, &item_id & $aid too
// The clean_request() is VERY powerful tool for infusion developers.
// If not just use FUSION_REQUEST as next recommended
echo openform("opret_aktivitet","POST", clean_request("section=ny_aktivitet", array("action", "item_id", "aid"), TRUE), array("class" => "m-t-20"));
echo "<div class='row'>\n";
echo "<div class='col-xs-12 col-sm-8'>\n";
echo form_hidden("func", $data['func']);
echo form_text("navn",utf8_encode("AKTIVITET"), $data['navn'],array(
    'placeholder' => utf8_encode('Angiv navn pÃ¥ aktivitet'),
    'required' => TRUE,
    'width' => '250px',
    'max_length' => 200,
    'error_text' => 'Skal udfyldes',
    "inline" => TRUE
));
echo form_text('url', utf8_encode("LINK"), $data['url'], array(
    "type" => "url",
    "placeholder" => "http://",
    "required" => TRUE,
    "inline" => TRUE
));
echo "</div>\n";
echo "<div class='col-xs-12 col-sm-4'>\n";
openside("ELEMENTER");
echo form_checkbox("kategori", utf8_encode("KATEGORI"), $data['kategori'], array("value" => "y")); // If your value is not 1/0
echo form_checkbox("menu", utf8_encode("MENU"), $data['menu'], array("reverse_label" => true)); // if you want to invert label
echo form_checkbox("kontakt", utf8_encode("KONTAKTFORMULAR"), $data['kontakt']);
closeside();
echo "</div>\n</div>\n";
echo form_button('opret_aktivitet',"GEM","GEM", array('class' => 'btn-primary m-t-10'));

echo closeform();

   

// This uploads your photo
if (!empty($_FILES['piktogram']) && is_uploaded_file($_FILES['piktogram']['tmp_name'])) {
               $upload = form_sanitizer($_FILES['piktogram'], "", "piktogram");
               if (empty($upload['error'])) {
                  $data['photo_filename'] = $upload['image_name'];
                  $data['photo_thumb1'] = $upload['thumb1_name'];
                  $data['photo_thumb2'] = $upload['thumb2_name'];
               }
            } 
print_p($data);
dbquery_insert(DB_PIKTOGRAM, $data, "save"); 
// or
dbquery_insert(DB_PIKTOGRAM, $data, "update"); 
}



$upload_settings = array(
            "upload_path" => BASEDIR.'billeder/',
            'required' => 1,
            'max_width' => $gll_settings['photo_max_w'],
            'max_height' => $gll_settings['photo_max_h'],
            'max_byte' => $gll_settings['photo_max_b'],
            'multiple' => FALSE,
            'delete_original' => FALSE,
            'inline' => TRUE,
            'error_text' => 'FEJL I BILLEDE',
                'ext_tip' => sprintf($locale['photo_0017'], parsebytesize($gll_settings['photo_max_b']), str_replace(',', ' ', ".jpg,.gif,.png"), $gll_settings['photo_max_w'], $gll_settings['photo_max_h'])
         );
         echo form_fileinput("piktogram", "Piktogram", "", $upload_settings);