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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 |
|---|---|
| 386 | if ( 'category' == $taxonomy ) { |
| 387 | /** |
| 388 | * Fires before the Add Category form. |
| 389 | * |
| 390 | * @since 2.1.0 |
| 391 | * @deprecated 3.0.0 Use {$taxonomy}_pre_add_form instead. |
| 392 | * |
| 393 | * @param object $arg Optional arguments cast to an object. |
| 394 | */ |
| 395 | do_action( 'add_category_form_pre', (object) array( 'parent' => 0 ) ); |
| 396 | } elseif ( 'link_category' == $taxonomy ) { |
| 397 | /** |
| 398 | * Fires before the link category form. |
| 399 | * |
| 400 | * @since 2.3.0 |
| 401 | * @deprecated 3.0.0 Use {$taxonomy}_pre_add_form instead. |
| 402 | * |
| 403 | * @param object $arg Optional arguments cast to an object. |
| 404 | */ |