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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 |
|---|---|
| 45 | * and 'post_author'. |
| 46 | * |
| 47 | * @since 2.6.0 |
| 48 | * @since 4.5.0 The `$post` parameter was added. |
| 49 | * |
| 50 | * @param array $fields List of fields to revision. Contains 'post_title', |
| 51 | * 'post_content', and 'post_excerpt' by default. |
| 52 | * @param array $post A post array being processed for insertion as a post revision. |
| 53 | */ |
| 54 | $fields = apply_filters( '_wp_post_revision_fields', $fields, $post ); |
| 55 | |
| 56 | // WP uses these internally either in versioning or elsewhere - they cannot be versioned. |
| 57 | foreach ( array( 'ID', 'post_name', 'post_parent', 'post_date', 'post_date_gmt', 'post_status', 'post_type', 'comment_count', 'post_author' ) as $protect ) { |
| 58 | unset( $fields[ $protect ] ); |
| 59 | } |
| 60 | |
| 61 | return $fields; |
| 62 | } |
| 63 | |