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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 | 
|---|---|
| 2381 |      } | 
| 2382 |  | 
| 2383 |      /** | 
| 2384 |       * Filters the expiration time of password reset keys. | 
| 2385 |       * | 
| 2386 |       * @since 4.3.0 | 
| 2387 |       * | 
| 2388 |       * @param int $expiration The expiration time in seconds. | 
| 2389 |       */ | 
| 2390 |      $expiration_duration = apply_filters( 'password_reset_expiration', DAY_IN_SECONDS ); | 
| 2391 |  | 
| 2392 |      if ( false !== strpos( $user->user_activation_key, ':' ) ) { | 
| 2393 |           list( $pass_request_time, $pass_key ) = explode( ':', $user->user_activation_key, 2 ); | 
| 2394 |           $expiration_time                      = $pass_request_time + $expiration_duration; | 
| 2395 |      } else { | 
| 2396 |           $pass_key        = $user->user_activation_key; | 
| 2397 |           $expiration_time = false; | 
| 2398 |      } | 
| 2399 |  |