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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 |
---|---|
388 | if ( 'category' == $taxonomy ) { |
389 | /** |
390 | * Fires before the Add Category form. |
391 | * |
392 | * @since 2.1.0 |
393 | * @deprecated 3.0.0 Use {$taxonomy}_pre_add_form instead. |
394 | * |
395 | * @param object $arg Optional arguments cast to an object. |
396 | */ |
397 | do_action( 'add_category_form_pre', (object) array( 'parent' => 0 ) ); |
398 | } elseif ( 'link_category' == $taxonomy ) { |
399 | /** |
400 | * Fires before the link category form. |
401 | * |
402 | * @since 2.3.0 |
403 | * @deprecated 3.0.0 Use {$taxonomy}_pre_add_form instead. |
404 | * |
405 | * @param object $arg Optional arguments cast to an object. |
406 | */ |