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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 | 
|---|---|
| 632 |      $user = get_user_by('login', $username); | 
| 633 |      if ( ! $user ) { | 
| 634 |           /** | 
| 635 |            * Fires if a bad username is entered in the user authentication process. | 
| 636 |            * | 
| 637 |            * @since 2.7.0 | 
| 638 |            * | 
| 639 |            * @param array $cookie_elements An array of data for the authentication cookie. | 
| 640 |            */ | 
| 641 |           do_action( 'auth_cookie_bad_username', $cookie_elements ); | 
| 642 |           return false; | 
| 643 |      } | 
| 644 |  | 
| 645 |      $pass_frag = substr($user->user_pass, 8, 4); | 
| 646 |  | 
| 647 |      $key = wp_hash($username . $pass_frag . '|' . $expiration, $scheme); | 
| 648 |      $hash = hash_hmac('md5', $username . '|' . $expiration, $key); | 
| 649 |  | 
| 650 |      if ( hash_hmac( 'md5', $hmac, $key ) !== hash_hmac( 'md5', $hash, $key ) ) { |