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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 |
---|---|
340 |
|
341 | if ( !empty($class) ) { |
342 | if ( !is_array( $class ) ) |
343 | $class = preg_split('#\s+#', $class); |
344 | $classes = array_merge($classes, $class); |
345 | } |
346 |
|
347 | $classes = array_map('esc_attr', $classes); |
348 |
|
349 | return apply_filters('post_class', $classes, $class, $post->ID); |
350 | } |
351 |
|
352 | /** |
353 | * Display the classes for the body element. |
354 | * |
355 | * @since 2.8.0 |
356 | * |
357 | * @param string|array $class One or more classes to add to the class list. |
358 | */ |