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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 | 
|---|---|
| 552 |           } | 
| 553 |  | 
| 554 |           /** | 
| 555 |            * Fires once the requested HTTP headers for caching, content type, etc. have been sent. | 
| 556 |            * | 
| 557 |            * @since 2.1.0 | 
| 558 |            * | 
| 559 |            * @param WP $wp Current WordPress environment instance (passed by reference). | 
| 560 |            */ | 
| 561 |           do_action_ref_array( 'send_headers', array( &$this ) ); | 
| 562 |      } | 
| 563 |  | 
| 564 |      /** | 
| 565 |       * Sets the query string property based off of the query variable property. | 
| 566 |       * | 
| 567 |       * The {@see 'query_string'} filter is deprecated, but still works. Plugins should | 
| 568 |       * use the {@see 'request'} filter instead. | 
| 569 |       * | 
| 570 |       * @since 2.0.0 |