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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 |
|---|---|
| 509 | } |
| 510 | |
| 511 | /** |
| 512 | * Fires once the requested HTTP headers for caching, content type, etc. have been sent. |
| 513 | * |
| 514 | * @since 2.1.0 |
| 515 | * |
| 516 | * @param WP $this Current WordPress environment instance (passed by reference). |
| 517 | */ |
| 518 | do_action_ref_array( 'send_headers', array( &$this ) ); |
| 519 | } |
| 520 | |
| 521 | /** |
| 522 | * Sets the query string property based off of the query variable property. |
| 523 | * |
| 524 | * The {@see 'query_string'} filter is deprecated, but still works. Plugins should |
| 525 | * use the {@see 'request'} filter instead. |
| 526 | * |
| 527 | * @since 2.0.0 |