Please need to clear up the next issue : for a code like this:
 <?php
   class Render {
      public static function displayDimensions($size){
         return $size["length"];
      }
    } 
  $size_arr = array ("length"=>8, "width"=>4);
  echo (Render::displayDimensions($size_arr));
 ?>
I cannot understand why php throwing in this notice:
PHP Notice: Undefined index: length in index.php on line 7
Thank you!)
 
    