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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 |
|---|---|
| 573 | * |
| 574 | * The dynamic portion of the hook name, `$post->post_type`, refers to |
| 575 | * the post type slug. |
| 576 | * |
| 577 | * @since 5.8.0 |
| 578 | * |
| 579 | * @param int $num Number of revisions to store. |
| 580 | * @param WP_Post $post Post object. |
| 581 | */ |
| 582 | $num = apply_filters( "wp_{$post->post_type}_revisions_to_keep", $num, $post ); |
| 583 | |
| 584 | return (int) $num; |
| 585 | } |
| 586 | |
| 587 | /** |
| 588 | * Sets up the post object for preview based on the post autosave. |
| 589 | * |
| 590 | * @since 2.7.0 |
| 591 | * @access private |