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The best way to understand what a hook does is to look at where it occurs in the source code.
do_action( "hook_name" )apply_filters( "hook_name", "what_to_filter" ).Remember, this hook may occur in more than one file. Moreover, the hook's context may change from version to version.
| Line | Code | 
|---|---|
| 5113 |      if ( !empty($imagedata['thumb']) && ($thumbfile = str_replace(basename($file), $imagedata['thumb'], $file)) && file_exists($thumbfile) ) { | 
| 5114 |           /** | 
| 5115 |            * Filter the attachment thumbnail file path. | 
| 5116 |            * | 
| 5117 |            * @since 2.1.0 | 
| 5118 |            * | 
| 5119 |            * @param string $thumbfile File path to the attachment thumbnail. | 
| 5120 |            * @param int    $post_id   Attachment ID. | 
| 5121 |            */ | 
| 5122 |           return apply_filters( 'wp_get_attachment_thumb_file', $thumbfile, $post->ID ); | 
| 5123 |      } | 
| 5124 |      return false; | 
| 5125 | } | 
| 5126 |  | 
| 5127 | /** | 
| 5128 |  * Retrieve URL for an attachment thumbnail. | 
| 5129 |  * | 
| 5130 |  * @since 2.1.0 | 
| 5131 |  * |