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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 | 
|---|---|
| 1336 |  * The echo content should be with usage of the permalinks or for creating the | 
| 1337 |  * robot.txt file. | 
| 1338 |  * | 
| 1339 |  * @since 2.1.0 | 
| 1340 |  * @uses do_action() Calls 'do_robotstxt' hook for displaying robot.txt rules. | 
| 1341 |  */ | 
| 1342 | function do_robots() { | 
| 1343 |      header( 'Content-Type: text/plain; charset=utf-8' ); | 
| 1344 |  | 
| 1345 |      do_action( 'do_robotstxt' ); | 
| 1346 |  | 
| 1347 |      if ( '0' == get_option( 'blog_public' ) ) { | 
| 1348 |           echo "User-agent: *\n"; | 
| 1349 |           echo "Disallow: /\n"; | 
| 1350 |      } else { | 
| 1351 |           echo "User-agent: *\n"; | 
| 1352 |           echo "Disallow:\n"; | 
| 1353 |      } | 
| 1354 | } |