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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 |
|---|---|
| 439 | exit(); |
| 440 | |
| 441 | /** |
| 442 | * Fires once the requested HTTP headers for caching, content type, etc. have been sent. |
| 443 | * |
| 444 | * @since 2.1.0 |
| 445 | * |
| 446 | * @param WP &$this Current WordPress environment instance (passed by reference). |
| 447 | */ |
| 448 | do_action_ref_array( 'send_headers', array( &$this ) ); |
| 449 | } |
| 450 | |
| 451 | /** |
| 452 | * Sets the query string property based off of the query variable property. |
| 453 | * |
| 454 | * The 'query_string' filter is deprecated, but still works. Plugins should |
| 455 | * use the 'request' filter instead. |
| 456 | * |
| 457 | * @since 2.0.0 |