February 12, 2011 
Definition:
function wp_get_attachment_thumb_url( $post_id = 0 ) {}
Retrieve URL for an attachment thumbnail.
Parameters
- int $post_id: Attachment ID
Return values
returns:False on failure. Thumbnail URL on success.
Defined filters
- wp_get_attachment_thumb_url
apply_filters( 'wp_get_attachment_thumb_url', $url, $post->ID )
Source code
function wp_get_attachment_thumb_url( $post_id = 0 ) {
$post_id = (int) $post_id;
if ( !$post =& get_post( $post_id ) )
return false;
if ( !$url = wp_get_attachment_url( $post->ID ) )
return false;
$sized = image_downsize( $post_id, 'thumbnail' );
if ( $sized )
return $sized[0];
if ( !$thumb = wp_get_attachment_thumb_file( $post->ID ) )
return false;
$url = str_replace(basename($url), basename($thumb), $url);
return apply_filters( 'wp_get_attachment_thumb_url', $url, $post->ID );
}
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A HitchHackers guide through WordPress 
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