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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 |
|---|---|
| 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 |
| 36 | */ |
| 37 | do_action( 'do_robots' ); |
| 38 | return; |
| 39 | elseif ( is_feed() ) : |
| 40 | do_feed(); |
| 41 | return; |
| 42 | elseif ( is_trackback() ) : |
| 43 | include( ABSPATH . 'wp-trackback.php' ); |
| 44 | return; |
| 45 | endif; |
| 46 | |