WordPress at a glance
function is not described

get_file() WP 1.0

No Hooks.

Return

Nothing (null).

Usage

get_file( $path );

Code of get file: wp-admin/includes/noop.php WP 5.2.2

<?php
function get_file( $path ) {

	if ( function_exists( 'realpath' ) ) {
		$path = realpath( $path );
	}

	if ( ! $path || ! @is_file( $path ) ) {
		return '';
	}

	return @file_get_contents( $path );
}