PHP MySQL Can´t make if inside while loop works retunrs always same id

I have this code, in which i have a if statement inside while loop, the problem is that i can't make it work because it always returns the same comment ID after the if statement is accomplished. I couldn´t found a solution. I'd appreciate any help. Thank you.

while($fila = mysql_fetch_assoc($resultado)) {
    $archivos  =  $fila['archivos'];
    $fecha  =  $fila['fecha'];
    $comentarioID  =  $fila['id'];
    $comentario = $fila['comentario'];
    if(strlen($comentario) > 100){
        $comentario = substr($comentario, 0, 100); 
        $vermas = '...<a href="" class="vermas" id="vermas_'.$comentarioID.'">Ver mas</a>';
    }
    echo $comentario.$vermas;
}