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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 |
|---|---|
| 191 | * engines from indexing the site. Hooking to this action serves a dual purpose: |
| 192 | * 1. Disable the single checkbox in favor of a multiple-choice list of radio buttons. |
| 193 | * 2. Open the door to adding additional radio button choices to the list. |
| 194 | * |
| 195 | * Hooking to this action also converts the 'Search engine visibility' heading to the more |
| 196 | * open-ended 'Site visibility' heading. |
| 197 | * |
| 198 | * @since 2.1.0 |
| 199 | */ |
| 200 | do_action( 'blog_privacy_selector' ); |
| 201 | ?> |
| 202 | <?php else : ?> |
| 203 | <label for="blog_public"><input name="blog_public" type="checkbox" id="blog_public" value="0" <?php checked( '0', get_option( 'blog_public' ) ); ?> /> |
| 204 | <?php _e( 'Discourage search engines from indexing this site' ); ?></label> |
| 205 | <p class="description"><?php _e( 'It is up to search engines to honor this request.' ); ?></p> |
| 206 | <?php endif; ?> |
| 207 | </fieldset></td> |
| 208 | </tr> |
| 209 | |