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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 |
|---|---|
| 539 | * Filters the number of revisions to save for the given post. |
| 540 | * |
| 541 | * Overrides the value of WP_POST_REVISIONS. |
| 542 | * |
| 543 | * @since 3.6.0 |
| 544 | * |
| 545 | * @param int $num Number of revisions to store. |
| 546 | * @param WP_Post $post Post object. |
| 547 | */ |
| 548 | return (int) apply_filters( 'wp_revisions_to_keep', $num, $post ); |
| 549 | } |
| 550 | |
| 551 | /** |
| 552 | * Sets up the post object for preview based on the post autosave. |
| 553 | * |
| 554 | * @since 2.7.0 |
| 555 | * @access private |
| 556 | * |
| 557 | * @param WP_Post $post |