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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 |
|---|---|
| 475 | /** |
| 476 | * Filter the list of CSS classes for the current post. |
| 477 | * |
| 478 | * @since 2.7.0 |
| 479 | * |
| 480 | * @param array $classes An array of post classes. |
| 481 | * @param string $class A comma-separated list of additional classes added to the post. |
| 482 | * @param int $post_id The post ID. |
| 483 | */ |
| 484 | $classes = apply_filters( 'post_class', $classes, $class, $post->ID ); |
| 485 | |
| 486 | return array_unique( $classes ); |
| 487 | } |
| 488 | |
| 489 | /** |
| 490 | * Display the classes for the body element. |
| 491 | * |
| 492 | * @since 2.8.0 |
| 493 | * |