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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 |
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654 | * Filters the number of revisions to save for the given post. |
655 | * |
656 | * Overrides the value of WP_POST_REVISIONS. |
657 | * |
658 | * @since 3.6.0 |
659 | * |
660 | * @param int $num Number of revisions to store. |
661 | * @param WP_Post $post Post object. |
662 | */ |
663 | $num = apply_filters( 'wp_revisions_to_keep', $num, $post ); |
664 |
|
665 | /** |
666 | * Filters the number of revisions to save for the given post by its post type. |
667 | * |
668 | * Overrides both the value of WP_POST_REVISIONS and the {@see 'wp_revisions_to_keep'} filter. |
669 | * |
670 | * The dynamic portion of the hook name, `$post->post_type`, refers to |
671 | * the post type slug. |
672 | * |