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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 |
|---|---|
| 4841 | |
| 4842 | if ( empty( $post_categories ) ) { |
| 4843 | /** |
| 4844 | * Filters post types (in addition to 'post') that require a default category. |
| 4845 | * |
| 4846 | * @since 5.5.0 |
| 4847 | * |
| 4848 | * @param string[] $post_types An array of post type names. Default empty array. |
| 4849 | */ |
| 4850 | $default_category_post_types = apply_filters( 'default_category_post_types', array() ); |
| 4851 | |
| 4852 | // Regular posts always require a default category. |
| 4853 | $default_category_post_types = array_merge( $default_category_post_types, array( 'post' ) ); |
| 4854 | |
| 4855 | if ( in_array( $post_type, $default_category_post_types, true ) |
| 4856 | && is_object_in_taxonomy( $post_type, 'category' ) |
| 4857 | && 'auto-draft' !== $post_status |
| 4858 | ) { |
| 4859 | $post_categories = array( get_option( 'default_category' ) ); |