<?php

// Was only available in Customizer > 4.6
if ( ! function_exists( 'sanitize_hex_color' ) ) {
	function sanitize_hex_color( $color ) {
		if ( '' === $color ) {
			return '';
		}

		// 3 or 6 hex digits, or the empty string.
		if ( preg_match('|^#([A-Fa-f0-9]{3}){1,2}$|', $color ) ) {
			return $color;
		}
	}
}