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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 |
---|---|
568 | /** |
569 | * Filters the list of CSS class names for the current post. |
570 | * |
571 | * @since 2.7.0 |
572 | * |
573 | * @param string[] $classes An array of post class names. |
574 | * @param string[] $class An array of additional class names added to the post. |
575 | * @param int $post_id The post ID. |
576 | */ |
577 | $classes = apply_filters( 'post_class', $classes, $class, $post->ID ); |
578 |
|
579 | return array_unique( $classes ); |
580 | } |
581 |
|
582 | /** |
583 | * Displays the class names for the body element. |
584 | * |
585 | * @since 2.8.0 |
586 | * |