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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 |
|---|---|
| 369 | |
| 370 | if ( !empty($class) ) { |
| 371 | if ( !is_array( $class ) ) |
| 372 | $class = preg_split('#\s+#', $class); |
| 373 | $classes = array_merge($classes, $class); |
| 374 | } |
| 375 | |
| 376 | $classes = array_map('esc_attr', $classes); |
| 377 | |
| 378 | return apply_filters('post_class', $classes, $class, $post->ID); |
| 379 | } |
| 380 | |
| 381 | /** |
| 382 | * Display the classes for the body element. |
| 383 | * |
| 384 | * @since 2.8.0 |
| 385 | * |
| 386 | * @param string|array $class One or more classes to add to the class list. |
| 387 | */ |