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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 | 
|---|---|
| 544 |  | 
| 545 |      // Quick check to see if an honest cookie has expired | 
| 546 |      if ( $expired < time() ) { | 
| 547 |           do_action('auth_cookie_expired', $cookie_elements); | 
| 548 |           return false; | 
| 549 |      } | 
| 550 |  | 
| 551 |      $user = get_userdatabylogin($username); | 
| 552 |      if ( ! $user ) { | 
| 553 |           do_action('auth_cookie_bad_username', $cookie_elements); | 
| 554 |           return false; | 
| 555 |      } | 
| 556 |  | 
| 557 |      $pass_frag = substr($user->user_pass, 8, 4); | 
| 558 |  | 
| 559 |      $key = wp_hash($username . $pass_frag . '|' . $expiration, $scheme); | 
| 560 |      $hash = hash_hmac('md5', $username . '|' . $expiration, $key); | 
| 561 |  | 
| 562 |      if ( $hmac != $hash ) { |