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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 |
|---|---|
| 592 | * Filters the number of revisions to save for the given post. |
| 593 | * |
| 594 | * Overrides the value of WP_POST_REVISIONS. |
| 595 | * |
| 596 | * @since 3.6.0 |
| 597 | * |
| 598 | * @param int $num Number of revisions to store. |
| 599 | * @param WP_Post $post Post object. |
| 600 | */ |
| 601 | $num = apply_filters( 'wp_revisions_to_keep', $num, $post ); |
| 602 | |
| 603 | /** |
| 604 | * Filters the number of revisions to save for the given post by its post type. |
| 605 | * |
| 606 | * Overrides both the value of WP_POST_REVISIONS and the {@see 'wp_revisions_to_keep'} filter. |
| 607 | * |
| 608 | * The dynamic portion of the hook name, `$post->post_type`, refers to |
| 609 | * the post type slug. |
| 610 | * |