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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 |
|---|---|
| 975 | if ( !is_array( $closed ) ) { |
| 976 | $classes = array( '' ); |
| 977 | } else { |
| 978 | $classes = in_array( $id, $closed ) ? array( 'closed' ) : array( '' ); |
| 979 | } |
| 980 | } else { |
| 981 | $classes = array( '' ); |
| 982 | } |
| 983 | |
| 984 | $classes = apply_filters( "postbox_classes_{$page}_{$id}", $classes ); |
| 985 | return implode( ' ', $classes ); |
| 986 | } |
| 987 | |
| 988 | /** |
| 989 | * {@internal Missing Short Description}} |
| 990 | * |
| 991 | * @since 2.5.0 |
| 992 | * |
| 993 | * @param int|object $id Post ID or post object. |