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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 |
|---|---|
| 4 | * |
| 5 | * @package WordPress |
| 6 | */ |
| 7 | if ( wp_using_themes() ) { |
| 8 | /** |
| 9 | * Fires before determining which template to load. |
| 10 | * |
| 11 | * @since 1.5.0 |
| 12 | */ |
| 13 | do_action( 'template_redirect' ); |
| 14 | } |
| 15 | |
| 16 | /** |
| 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 |