Wordpress minimum functions.php for child theme

functions.php

<?php
	function mychildtheme_enqueue_styles() {
		$parent_style = 'parent-style';
		wp_enqueue_style( $parent_style, get_template_directory_uri() . '/style.css' );
		wp_enqueue_style( 'child-style',
			get_stylesheet_directory_uri() . '/style.css',
			array( $parent_style )
		);
	}
	add_action( 'wp_enqueue_scripts', 'mychildtheme_enqueue_styles' );
?>