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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 |
|---|---|
| 1 | <?php |
| 2 | /** |
| 3 | * Loads the correct template based on the visitor's url |
| 4 | * @package WordPress |
| 5 | */ |
| 6 | if ( defined('WP_USE_THEMES') && WP_USE_THEMES ) |
| 7 | do_action('template_redirect'); |
| 8 | |
| 9 | // Halt template load for HEAD requests. Performance bump. See #14348 |
| 10 | if ( 'HEAD' === $_SERVER['REQUEST_METHOD'] && apply_filters( 'exit_on_http_head', true ) ) |
| 11 | exit(); |
| 12 | |
| 13 | // Process feeds and trackbacks even if not using themes. |
| 14 | if ( is_robots() ) : |
| 15 | do_action('do_robots'); |
| 16 | return; |
| 17 | elseif ( is_feed() ) : |
| 18 | do_feed(); |
| 19 | return; |