<?php
add_shortcode( 'lnvsdn', 'lnvsdn' );
function lnvsdn(){ob_start();
$tam = ''; $tot=''; $array = array();    
if (isset($_POST['pangkas'])) {
$a = $_POST['ln']; $b = $_POST['dn'];     
$hidup = array_filter(explode('*', $a));
$mati = array_filter(explode('*', $b));
if (!empty($a) && !empty($b)) {
$array = array_merge($array, $mati);
$valx = array_diff($hidup, $array); 
asort($valx);
$tot=count($valx);
$angka=''; 
foreach ($valx as $value) {
   $angka .= $value.'*' ;
}
$tam = '<textarea class="form-control" rows="5" id="comment">'.$angka.'</textarea>'; 
    }
}    
?>
Masukkan angka 2d, 3d atau 4d dan pisahkan dengan tanda * dimasing2 kolom<br>
<form role="form" method="POST">
 <div class="row">
<div class="col-sm-6">
  <div class="card">
			<div class="card-header text-center bg-success text-white font-weight-bold">LN ON</div>
			<div class="card-body p-1" >
				<textarea name="ln" class="form-control" rows="5" id="comment"><?php if (isset($_POST['ln'])) {echo $_POST['ln'];} ?></textarea>
			</div>
		</div>
</div>
   
<div class="col-sm-6">
  <div class="card">
			<div class="card-header text-center bg-danger text-white font-weight-bold">LN OFF</div>
			<div class="card-body p-1">
				<textarea name="dn" class="form-control" rows="5" id="comment"><?php if (isset($_POST['dn'])) {echo $_POST['dn'];} ?></textarea>
			</div>
		</div>
</div>
<div class="col-sm-12 mb-3 text-center">

          <h6 class="pull-left" id="count_message"></h6>
          <button class="btn btn-warning" id="postBtn" type="submit" name="pangkas">Pangkas</button>
</div>  
  </div>
</form>
 <div class="row">
<div class="col-md-12">
  <div class="card">
			<div class="card-header text-center bg-primary text-white font-weight-bold">HASIL PANGKASAN <?php if (!empty($tot)) { echo $tot;} else {echo '0';}?> LN</div>
			<div class="card-body p-1">
      <?php if (!empty($tam)) { echo $tam;} else {echo '<textarea class="form-control" rows="5" id="comment"></textarea>';}?>
               </div>
</div>
   </div>
    </div>
<?php return ob_get_clean(); }?>