WordPress at a glance
function is not described

WP_REST_Revisions_Controller::get_revision() protected WP 4.7.2

Get the revision, if the ID is valid.

It's a method of the class: WP_REST_Revisions_Controller{}

No Hooks.

Return

WP_Post/WP_Error. Revision post object if ID is valid, WP_Error otherwise.

Usage

// protected - for code of main (parent) or child class
$result = $this->get_revision( $id );
$id(int) (required)
Supplied ID.

Changelog

Since 4.7.2 Introduced.

Code of WP_REST_Revisions_Controller::get_revision() WP 5.5.1

<?php
protected function get_revision( $id ) {
	$error = new WP_Error(
		'rest_post_invalid_id',
		__( 'Invalid revision ID.' ),
		array( 'status' => 404 )
	);

	if ( (int) $id <= 0 ) {
		return $error;
	}

	$revision = get_post( (int) $id );
	if ( empty( $revision ) || empty( $revision->ID ) || 'revision' !== $revision->post_type ) {
		return $error;
	}

	return $revision;
}