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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 |
|---|---|
| 17 | * Filters whether to allow 'HEAD' requests to generate content. |
| 18 | * |
| 19 | * Provides a significant performance bump by exiting before the page |
| 20 | * content loads for 'HEAD' requests. See #14348. |
| 21 | * |
| 22 | * @since 3.5.0 |
| 23 | * |
| 24 | * @param bool $exit Whether to exit without generating any content for 'HEAD' requests. Default true. |
| 25 | */ |
| 26 | if ( 'HEAD' === $_SERVER['REQUEST_METHOD'] && apply_filters( 'exit_on_http_head', true ) ) { |
| 27 | exit(); |
| 28 | } |
| 29 | |
| 30 | // Process feeds and trackbacks even if not using themes. |
| 31 | if ( is_robots() ) { |
| 32 | /** |
| 33 | * Fired when the template loader determines a robots.txt request. |
| 34 | * |
| 35 | * @since 2.1.0 |