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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 |
---|---|
349 | if ( 'category' == $taxonomy ) { |
350 | /** |
351 | * Fires before the Add Category form. |
352 | * |
353 | * @since 2.1.0 |
354 | * @deprecated 3.0.0 Use {$taxonomy}_pre_add_form instead. |
355 | * |
356 | * @param object $arg Optional arguments cast to an object. |
357 | */ |
358 | do_action( 'add_category_form_pre', (object) array( 'parent' => 0 ) ); |
359 | } elseif ( 'link_category' == $taxonomy ) { |
360 | /** |
361 | * Fires before the link category form. |
362 | * |
363 | * @since 2.3.0 |
364 | * @deprecated 3.0.0 Use {$taxonomy}_pre_add_form instead. |
365 | * |
366 | * @param object $arg Optional arguments cast to an object. |
367 | */ |