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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 |
|---|---|
| 39 | * Disallowed fields: 'ID', 'post_name', 'post_parent', 'post_date', |
| 40 | * 'post_date_gmt', 'post_status', 'post_type', 'comment_count', |
| 41 | * and 'post_author'. |
| 42 | * |
| 43 | * @since 2.6.0 |
| 44 | * |
| 45 | * @param array $fields List of fields to revision. Contains 'post_title', |
| 46 | * 'post_content', and 'post_excerpt' by default. |
| 47 | */ |
| 48 | $fields = apply_filters( '_wp_post_revision_fields', $fields ); |
| 49 | |
| 50 | // WP uses these internally either in versioning or elsewhere - they cannot be versioned |
| 51 | foreach ( array( 'ID', 'post_name', 'post_parent', 'post_date', 'post_date_gmt', 'post_status', 'post_type', 'comment_count', 'post_author' ) as $protect ) |
| 52 | unset( $fields[$protect] ); |
| 53 | } |
| 54 | |
| 55 | if ( !is_array($post) ) |
| 56 | return $fields; |
| 57 | |