Snippet to show the notice message on WooCommerce Cart and Checkout if any particular word found in Address line one and two. PluginHive Shipping Plugins supported - https://www.pluginhive.com/product/multiple-carrier-shipping-plugin-woocommerce/, https://www.pluginhive.com/product/woocommerce-ups-shipping-plugin-with-print-label/, https://www.p…

functions.php

/**
 * Snippet to show the notice message on Cart and Checkout if any particular word found in Address line one and two.
 * Created at : 24 July 2018
 * Updated at : 24 July 2018
 * PluginHive Plugins : https://www.pluginhive.com/plugins/
 * Gist Link : 
 */
add_filter( 'woocommerce_package_rates', 'ph_add_notice_if_po_box_addresses', 10, 2 );

if( ! function_exists('ph_add_notice_if_po_box_addresses') ) {
	function ph_add_notice_if_po_box_addresses( $shipping_rates, $package) {

		$words = array( 'PO BOX' );		// Provide the text
		$message_to_display = "UPS doesn't deliver on PO Box addresses. Please use correct address to use UPS Services.";	// Message to display

		$address_line_one_and_two = strtolower($package['destination']['address'].' '.$package['destination']['address_2']);
		foreach( $words as $word ) {
			if( strstr( $address_line_one_and_two, strtolower($word) ) !== false ) {
				wc_add_notice( print_r($message_to_display, true), 'error' );
			}
		}
		return $shipping_rates;
	}
}