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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 |
|---|---|
| 368 | if ( 'category' == $taxonomy ) { |
| 369 | /** |
| 370 | * Fires before the Add Category form. |
| 371 | * |
| 372 | * @since 2.1.0 |
| 373 | * @deprecated 3.0.0 Use {$taxonomy}_pre_add_form instead. |
| 374 | * |
| 375 | * @param object $arg Optional arguments cast to an object. |
| 376 | */ |
| 377 | do_action( 'add_category_form_pre', (object) array( 'parent' => 0 ) ); |
| 378 | } elseif ( 'link_category' == $taxonomy ) { |
| 379 | /** |
| 380 | * Fires before the link category form. |
| 381 | * |
| 382 | * @since 2.3.0 |
| 383 | * @deprecated 3.0.0 Use {$taxonomy}_pre_add_form instead. |
| 384 | * |
| 385 | * @param object $arg Optional arguments cast to an object. |
| 386 | */ |