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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 | 
|---|---|
| 22 |  | 
| 23 | $action = 'admin_post'; | 
| 24 |  | 
| 25 | if ( !wp_validate_auth_cookie() ) | 
| 26 |      $action .= '_nopriv'; | 
| 27 |  | 
| 28 | if ( !empty($_REQUEST['action']) ) | 
| 29 |      $action .= '_' . $_REQUEST['action']; | 
| 30 |  | 
| 31 | do_action($action); | 
| 32 |  | 
| 33 | ?> |