$pattern = '@(width|height)="([0-9]+)"@';
$str = "<object width=\"300\" height=\"247\"><param name=\"movie\" value=\"http://www.youtube.com/v/YNb5dfeI93I\"></param><param name=\"wmode\" value=\"transparent\"></param><embed src=\"http://www.youtube.com/v/YNb5dfeI93I\" type=\"application/x-shockwave-flash\" wmode=\"transparent\" width=\"123\" height=\"441\"></embed></object>";
preg_match_all($pattern, $str, $out, PREG_PATTERN_ORDER);
$width = $out[2][0];
$height = $out[2][1];
$width2 = $out[2][2];
$height2 = $out[2][3];
if ($height > 150)
          {
               $height = 150;
               $percent = ($height2 / $height);
               $width = ($width2 / $percent);
          }
     else if ($width > 150)
          {
               $width = 150;
               $percent = ($width2 / $width);
               $height = ($height2 / $percent);
          }
          echo $width." ".$height."\n";
          $rep = "$1=$width $2=$height";
          echo preg_replace($pattern, $rep, $str);