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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 |
|---|---|
| 473 | * Filter the number of revisions to save for the given post. |
| 474 | * |
| 475 | * Overrides the value of WP_POST_REVISIONS. |
| 476 | * |
| 477 | * @since 3.6.0 |
| 478 | * |
| 479 | * @param int $num Number of revisions to store. |
| 480 | * @param WP_Post $post Post object. |
| 481 | */ |
| 482 | return (int) apply_filters( 'wp_revisions_to_keep', $num, $post ); |
| 483 | } |
| 484 | |
| 485 | /** |
| 486 | * Sets up the post object for preview based on the post autosave. |
| 487 | * |
| 488 | * @since 2.7.0 |
| 489 | * @access private |
| 490 | */ |
| 491 | function _set_preview($post) { |