$metin=  $this->kategoriler_model->kategoriadi($category);

buradan gelen veriyi yazdır , varmı yokmu
şuradada 2 değişkende aynı isimde daha önce hiç böyle kullanmadım oda sıkıntı çıkarıyor olabilir.

foreach ($category as $category ) {

$output .= '<option value="' . $c['CatID'] . '" '. $c['CatID'] == $kat['CatParID'] ? 'selected' : '' .'>' . $indent . $c['KategoriAdi'] . '</option>';

hatta bunu direk o satıra yaz

$c['CatID'] == $kat['CatParID'] ? 'selected' : ''

bunu oraya yaz.
http://www.erbilen.net/ternary-uclu-operator-kullanimi-php/

tinymce.init({
            selector: 'textarea.editor',
    		plugins: 'print preview searchreplace autolink directionality visualblocks visualchars fullscreen image link media template codesample table charmap hr pagebreak nonbreaking anchor toc insertdatetime advlist lists textcolor wordcount imagetools contextmenu colorpicker textpattern help',
            toolbar1: 'formatselect | bold italic strikethrough forecolor backcolor | link | alignleft aligncenter alignright alignjustify  | numlist bullist outdent indent  | removeformat',
          });

tinymce sayfada başlattığın yerde plugins: yazan yerden kullanmak istemediğin eklentilerin isimlerini sil.

echo explode(',',$metin);

explode ile böldüğünde veriyi array olarak verir echo ile yazdırdığındandır.print_r() ile yazdır veya tekrar foreach kullan.

    $mtn = explode(',',$metin);
    foreach($mtn as $text){
        echo $text;
    }

Phpde bunla ilgili fonksiyonlar var ama javascript te varmı bilmiyorum.
money_format() veya number_format()

<input onChange="myFunction()" type="number" id="myText" value="0">
<button id="btn">Try it</button>
<script>
function myFunction() {
  var x = document.getElementById("myText").value;
  document.getElementById("btn").value = x;
  document.getElementById("btn").innerHTML = x + " Teklif Et";
}
</script>

veya JQuery ile şağıdaki gibi yapabilirsin.

<input type="number" id="myText" value="0">
<button id="btn">Try it</button>
<script>
$( "#myText" ).change(function() {
  var v = $("#myText").prop("value");
    
    $("#btn").text(v+" Teklif et");
    $("#btn").prop("value", v);
});
</script>

<input onChange="myFunction()" type="text" id="myText" value="Some text...">
<button id="btn">Try it</button>
<script>
function myFunction() {
  var x = document.getElementById("myText").value;
  document.getElementById("btn").value = x;
}
</script>

Elimde eski bir kod var bende bi yerden bulmuştum.Kendine göre düzenleyip kulllan.

function pagination($current_page, $total_records, $total_pages, $page_url)
{
    $pagination = '';
    if($total_pages > 0 && $total_pages != 1 && $current_page <= $total_pages){ //verify total pages and current page number
        $pagination .= '<ul>';

        $right_links    = $current_page + 3;
        $previous       = $current_page - 1; //previous link
        $next           = $current_page + 1; //next link
        $first_link     = true; //boolean var to decide our first link

        if($current_page > 1){
			$previous_link = ($previous==0)?1:$previous;
            $pagination .= '<li class="pagination"><a href="'.$page_url.'?page=1">İlk</a></li>'; //first link
            $pagination .= '<li class="pagination"><a href="'.$page_url.'?page='.$previous_link.'">Önceki</a></li>'; //previous link
                for($i = ($current_page-2); $i < $current_page; $i++){ //Create left-hand side links
                    if($i > 0){
                        $pagination .= '<li class="pagination"><a href="'.$page_url.'?page='.$i.'">'.$i.'</a></li>';
                    }
                }
            $first_link = false; //set first link to false
        }

        if($first_link){ //if current active page is first link
            $pagination .= '<li class="active pagination">'.$current_page.'</li>';
        }elseif($current_page == $total_pages){ //if it's the last active link
            $pagination .= '<li class="active pagination">'.$current_page.'</li>';
        }else{ //regular current link
            $pagination .= '<li class="active pagination">'.$current_page.'</li>';
        }

        for($i = $current_page+1; $i < $right_links ; $i++){ //create right-hand side links
            if($i<=$total_pages){
                $pagination .= '<li class="pagination"><a href="'.$page_url.'?page='.$i.'">'.$i.'</a></li>';
            }
        }
        if($current_page < $total_pages){
				$next_link = ($next > $total_pages)? $total_pages : $next;
                $pagination .= '<li class="pagination"><a href="'.$page_url.'?page='.$next_link.'">İleri</a></li>'; //next link
                $pagination .= '<li class="pagination"><a href="'.$page_url.'?page='.$total_pages.'">Son</a></li>'; //last link
        }

        $pagination .= '</ul>';
    }
    return $pagination; //return pagination links
}

parcala.length; ile sayısını öğrenebilirsin.