The php getimagesize function obtains image width and height information

$images_array = array("http://static.zend.com/img/logo.gif");
foreach($images_array as $image)
{
  list($width, $height, $type, $attr) = getimagesize($image);
  $new_height = (int)(192 / $width * $height);
  echo '
';
}