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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 |
|---|---|
| 417 | |
| 418 | if ( true === $num ) |
| 419 | $num = -1; |
| 420 | else |
| 421 | $num = intval( $num ); |
| 422 | |
| 423 | if ( ! post_type_supports( $post->post_type, 'revisions' ) ) |
| 424 | $num = 0; |
| 425 | |
| 426 | return (int) apply_filters( 'wp_revisions_to_keep', $num, $post ); |
| 427 | } |
| 428 | |
| 429 | /** |
| 430 | * Sets up the post object for preview based on the post autosave. |
| 431 | * |
| 432 | * @since 2.7.0 |
| 433 | * @access private |
| 434 | */ |
| 435 | function _set_preview($post) { |