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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 |
|---|---|
| 570 | /** |
| 571 | * Filters the list of CSS class names for the current post. |
| 572 | * |
| 573 | * @since 2.7.0 |
| 574 | * |
| 575 | * @param string[] $classes An array of post class names. |
| 576 | * @param string[] $class An array of additional class names added to the post. |
| 577 | * @param int $post_id The post ID. |
| 578 | */ |
| 579 | $classes = apply_filters( 'post_class', $classes, $class, $post->ID ); |
| 580 | |
| 581 | return array_unique( $classes ); |
| 582 | } |
| 583 | |
| 584 | /** |
| 585 | * Displays the class names for the body element. |
| 586 | * |
| 587 | * @since 2.8.0 |
| 588 | * |