WC_Tax::get_rates_for_tax_class() │ public static │ WC 1.0

Used by admin settings page.

Method of the class: WC_Tax{}

No Hooks.

Return

Array|null|Object.

Usage

$result = WC_Tax::get_rates_for_tax_class( $tax_class );
$tax_class(string) (required)
Tax class slug.

WC_Tax::get_rates_for_tax_class() code WC 9.5.1

woocommerce/includes/class-wc-tax.php 
public static function get_rates_for_tax_class( $tax_class ) {
	global $wpdb;

	$tax_class = self::format_tax_rate_class( $tax_class );

	// Get all the rates and locations. Snagging all at once should significantly cut down on the number of queries.
	$rates     = $wpdb->get_results( $wpdb->prepare( "SELECT * FROM `{$wpdb->prefix}woocommerce_tax_rates` WHERE `tax_rate_class` = %s;", $tax_class ) );
	$locations = $wpdb->get_results( "SELECT * FROM `{$wpdb->prefix}woocommerce_tax_rate_locations`" );

	if ( ! empty( $rates ) ) {
		// Set the rates keys equal to their ids.
		$rates = array_combine( wp_list_pluck( $rates, 'tax_rate_id' ), $rates );
	}

	// Drop the locations into the rates array.
	foreach ( $locations as $location ) {
		// Don't set them for nonexistent rates.
		if ( ! isset( $rates[ $location->tax_rate_id ] ) ) {
			continue;
		}
		// If the rate exists, initialize the array before appending to it.
		if ( ! isset( $rates[ $location->tax_rate_id ]->{$location->location_type} ) ) {
			$rates[ $location->tax_rate_id ]->{$location->location_type} = array();
		}
		$rates[ $location->tax_rate_id ]->{$location->location_type}[] = $location->location_code;
	}

	foreach ( $rates as $rate_id => $rate ) {
		$rates[ $rate_id ]->postcode_count = isset( $rates[ $rate_id ]->postcode ) ? count( $rates[ $rate_id ]->postcode ) : 0;
		$rates[ $rate_id ]->city_count     = isset( $rates[ $rate_id ]->city ) ? count( $rates[ $rate_id ]->city ) : 0;
	}

	$rates = self::sort_rates( $rates );

	return $rates;
}