WordPress at a glance
function is not described

_wp_post_revision_fields() WP 2.6.0

Determines which fields of posts are to be saved in revisions.

  • Static. Array. $fields
  • Since 4.5.0 A WP_Post object can now be passed to the $post parameter.
  • Since 4.5.0 The optional $autosave parameter was deprecated and renamed to $deprecated.
Hooks in function
Return

Array. Array of fields that can be versioned.

Usage

_wp_post_revision_fields( $post, $deprecated );
$post(array/WP_Post)
A post array or a WP_Post object being processed for insertion as a post revision.
Default: empty array
$deprecated(true/false)
Not used.
Default: false

Code of wp post revision fields: wp-includes/revision.php VER 5.0.3

<?php
function _wp_post_revision_fields( $post = array(), $deprecated = false ) {
	static $fields = null;

	if ( ! is_array( $post ) ) {
		$post = get_post( $post, ARRAY_A );
	}

	if ( is_null( $fields ) ) {
		// Allow these to be versioned
		$fields = array(
			'post_title' => __( 'Title' ),
			'post_content' => __( 'Content' ),
			'post_excerpt' => __( 'Excerpt' ),
		);
	}

	/**
	 * Filters the list of fields saved in post revisions.
	 *
	 * Included by default: 'post_title', 'post_content' and 'post_excerpt'.
	 *
	 * Disallowed fields: 'ID', 'post_name', 'post_parent', 'post_date',
	 * 'post_date_gmt', 'post_status', 'post_type', 'comment_count',
	 * and 'post_author'.
	 *
	 * @since 2.6.0
	 * @since 4.5.0 The `$post` parameter was added.
	 *
	 * @param array $fields List of fields to revision. Contains 'post_title',
	 *                      'post_content', and 'post_excerpt' by default.
	 * @param array $post   A post array being processed for insertion as a post revision.
	 */
	$fields = apply_filters( '_wp_post_revision_fields', $fields, $post );

	// WP uses these internally either in versioning or elsewhere - they cannot be versioned
	foreach ( array( 'ID', 'post_name', 'post_parent', 'post_date', 'post_date_gmt', 'post_status', 'post_type', 'comment_count', 'post_author' ) as $protect ) {
		unset( $fields[ $protect ] );
	}


	return $fields;
}