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Source View: wp_get_attachment_url

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Line Code
3909                     $url = $uploads['baseurl'] . substr( $file, strpos($file, 'wp-content/uploads') + 18 );
3910                else
3911                     $url = $uploads['baseurl'] . "/$file"; //Its a newly uploaded file, therefor $file is relative to the basedir.
3912           }
3913      }
3914
3915      if ( empty($url) ) //If any of the above options failed, Fallback on the GUID as used pre-2.7, not recomended to rely upon this.
3916           $url = get_the_guid( $post->ID );
3917
3918      $url = apply_filters( 'wp_get_attachment_url', $url, $post->ID );
3919
3920      if ( 'attachment' != $post->post_type || empty( $url ) )
3921           return false;
3922
3923      return $url;
3924 }
3925
3926 /**
3927  * Retrieve thumbnail for an attachment.