<?PHP

class YouTubeThumbnailImage {

/* $image_id can be 1, 2, 3 at 120px x 90px or hqdefault at 480px × 360px */

public function get_image_tag( $youtube_url = ”, $image_id = 1, $title = ‘YouTube Video’ ){

if( $image_id > 0 && $image_id < 4 ){
$width = 120;
$height = 90;
}elseif( $image_id == ‘hqdefault’ ){
$width = 480;
$height = 360;
}else{
$image_id = 1
$width = 120;
$height = 90;
}

return ‘<img src=”‘ . $this->image_url( $youtube_url, $image_id ) . ‘” width=”‘ . $width . ‘” height=”‘ . $height . ‘” alt=”‘ . $title . ‘” title=”‘ . $title . ‘” border=”0″ />’;

}

private function get_youtube_id( $youtube_url ){

$url_parts = explode( ‘?v=’, $youtube_url );

if( count( $url_parts ) == 2 ){
$tmp = explode( ‘&’, $url_parts[1] );
if( count( $tmp ) > 1 ){ return $tmp[0]; }else{ return $parts[1]; }
}else{
return $youtube_url;
}
}

private function image_url( $youtube_url, $image_id ){

$youtube_id = $this->get_youtube_id( $youtube_url );
return ‘http://img.youtube.com/vi/’ . $youtube_id . ‘/’ . $image_id . ‘.jpg’;

}

}

?>

$YouTubeThumbnailImage = new YouTubeThumbnailImage();

echo $YouTubeThumbnailImage->get_image_tag( ‘qg4I_I3pfXs’, 1, ‘Test Video Thumbnail’ );

or

echo $YouTubeThumbnailImage->get_image_tag( ‘http://www.youtube.com/watch?v=qg4I_I3pfXs’, 2, ‘Test Video Thumbnail’ );