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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 |
|---|---|
| 593 | /** |
| 594 | * Filters the list of CSS class names for the current post. |
| 595 | * |
| 596 | * @since 2.7.0 |
| 597 | * |
| 598 | * @param string[] $classes An array of post class names. |
| 599 | * @param string[] $css_class An array of additional class names added to the post. |
| 600 | * @param int $post_id The post ID. |
| 601 | */ |
| 602 | $classes = apply_filters( 'post_class', $classes, $css_class, $post->ID ); |
| 603 | |
| 604 | return array_unique( $classes ); |
| 605 | } |
| 606 | |
| 607 | /** |
| 608 | * Displays the class names for the body element. |
| 609 | * |
| 610 | * @since 2.8.0 |
| 611 | * |