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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 | 
|---|---|
| 1092 |  * The echo content should be with usage of the permalinks or for creating the | 
| 1093 |  * robots.txt file. | 
| 1094 |  * | 
| 1095 |  * @since 2.1.0 | 
| 1096 |  * @uses do_action() Calls 'do_robotstxt' hook for displaying robots.txt rules. | 
| 1097 |  */ | 
| 1098 | function do_robots() { | 
| 1099 |      header( 'Content-Type: text/plain; charset=utf-8' ); | 
| 1100 |  | 
| 1101 |      do_action( 'do_robotstxt' ); | 
| 1102 |  | 
| 1103 |      $output = "User-agent: *\n"; | 
| 1104 |      $public = get_option( 'blog_public' ); | 
| 1105 |      if ( '0' == $public ) { | 
| 1106 |           $output .= "Disallow: /\n"; | 
| 1107 |      } else { | 
| 1108 |           $site_url = parse_url( site_url() ); | 
| 1109 |           $path = ( !empty( $site_url['path'] ) ) ? $site_url['path'] : ''; | 
| 1110 |           $output .= "Disallow: $path/wp-admin/\n"; |