^^&&^^

Edit File: class-kkart-settings-tax.php

<?php
/**
 * Kkart Tax Settings
 *
 * @author      WooThemes
 * @category    Admin
 * @package     Kkart\Admin
 * @version     2.1.0
 */

if ( ! defined( 'ABSPATH' ) ) {
	exit;
}

if ( class_exists( 'KKART_Settings_Tax', false ) ) {
	return new KKART_Settings_Tax();
}

/**
 * KKART_Settings_Tax.
 */
class KKART_Settings_Tax extends KKART_Settings_Page {

/**
	 * Constructor.
	 */
	public function __construct() {
		$this->id    = 'tax';
		$this->label = __( 'Tax', 'kkart' );

add_filter( 'kkart_settings_tabs_array', array( $this, 'add_settings_page' ), 20 );

if ( kkart_tax_enabled() ) {
			add_action( 'kkart_sections_' . $this->id, array( $this, 'output_sections' ) );
			add_action( 'kkart_settings_' . $this->id, array( $this, 'output' ) );
			add_action( 'kkart_settings_save_' . $this->id, array( $this, 'save' ) );
		}
	}

/**
	 * Add this page to settings.
	 *
	 * @param array $pages Existing pages.
	 * @return array|mixed
	 */
	public function add_settings_page( $pages ) {
		if ( kkart_tax_enabled() ) {
			return parent::add_settings_page( $pages );
		} else {
			return $pages;
		}
	}

/**
	 * Get sections.
	 *
	 * @return array
	 */
	public function get_sections() {
		$sections = array(
			''         => __( 'Tax options', 'kkart' ),
			'standard' => __( 'Standard rates', 'kkart' ),
		);

// Get tax classes and display as links.
		$tax_classes = KKART_Tax::get_tax_classes();

foreach ( $tax_classes as $class ) {
			$sections[ sanitize_title( $class ) ] = sprintf( __( '%s rates', 'kkart' ), $class );
		}

return apply_filters( 'kkart_get_sections_' . $this->id, $sections );
	}

/**
	 * Get settings array.
	 *
	 * @param string $current_section Current section being shown.
	 * @return array
	 */
	public function get_settings( $current_section = '' ) {
		$settings = array();

if ( '' === $current_section ) {
			$settings = include __DIR__ . '/views/settings-tax.php';
		}
		return apply_filters( 'kkart_get_settings_' . $this->id, $settings, $current_section );
	}

/**
	 * Output the settings.
	 */
	public function output() {
		global $current_section;

$tax_classes = KKART_Tax::get_tax_class_slugs();

if ( 'standard' === $current_section || in_array( $current_section, $tax_classes, true ) ) {
			$this->output_tax_rates();
		} else {
			$settings = $this->get_settings();

KKART_Admin_Settings::output_fields( $settings );
		}
	}

/**
	 * Save settings.
	 */
	public function save() {
		// phpcs:disable WordPress.Security.NonceVerification.Missing
		global $current_section;

if ( ! $current_section ) {
			$settings = $this->get_settings();
			KKART_Admin_Settings::save_fields( $settings );

if ( isset( $_POST['kkart_tax_classes'] ) ) {
				$this->save_tax_classes( wp_unslash( $_POST['kkart_tax_classes'] ) ); // phpcs:ignore WordPress.Security.ValidatedSanitizedInput.InputNotSanitized
			}
		} elseif ( ! empty( $_POST['tax_rate_country'] ) ) {
			$this->save_tax_rates();
		}

if ( $current_section ) {
			do_action( 'kkart_update_options_' . $this->id . '_' . $current_section );
		}

// Invalidate caches.
		KKART_Cache_Helper::invalidate_cache_group( 'taxes' );
		KKART_Cache_Helper::get_transient_version( 'shipping', true );
		// phpcs:enable WordPress.Security.NonceVerification.Missing
	}

/**
	 * Saves tax classes defined in the textarea to the tax class table instead of an option.
	 *
	 * @param string $raw_tax_classes Posted value.
	 * @return null
	 */
	public function save_tax_classes( $raw_tax_classes ) {
		$tax_classes          = array_filter( array_map( 'trim', explode( "\n", $raw_tax_classes ) ) );
		$existing_tax_classes = KKART_Tax::get_tax_classes();
		$removed              = array_diff( $existing_tax_classes, $tax_classes );
		$added                = array_diff( $tax_classes, $existing_tax_classes );

foreach ( $removed as $name ) {
			KKART_Tax::delete_tax_class_by( 'name', $name );
		}

foreach ( $added as $name ) {
			KKART_Tax::create_tax_class( $name );
		}

return null;
	}

/**
	 * Output tax rate tables.
	 */
	public function output_tax_rates() {
		global $current_section;

$current_class = $this->get_current_tax_class();

$countries = array();
		foreach ( KKART()->countries->get_allowed_countries() as $value => $label ) {
			$countries[] = array(
				'value' => $value,
				'label' => esc_js( html_entity_decode( $label ) ),
			);
		}

$states = array();
		foreach ( KKART()->countries->get_allowed_country_states() as $label ) {
			foreach ( $label as $code => $state ) {
				$states[] = array(
					'value' => $code,
					'label' => esc_js( html_entity_decode( $state ) ),
				);
			}
		}

$base_url = admin_url(
			add_query_arg(
				array(
					'page'    => 'kkart-settings',
					'tab'     => 'tax',
					'section' => $current_section,
				),
				'admin.php'
			)
		);

// Localize and enqueue our js.
		wp_localize_script(
			'kkart-settings-tax',
			'htmlSettingsTaxLocalizeScript',
			array(
				'current_class' => $current_class,
				'kkart_tax_nonce'  => wp_create_nonce( 'kkart_tax_nonce-class:' . $current_class ),
				'base_url'      => $base_url,
				'rates'         => array_values( KKART_Tax::get_rates_for_tax_class( $current_class ) ),
				'page'          => ! empty( $_GET['p'] ) ? absint( $_GET['p'] ) : 1,
				'limit'         => 100,
				'countries'     => $countries,
				'states'        => $states,
				'default_rate'  => array(
					'tax_rate_id'       => 0,
					'tax_rate_country'  => '',
					'tax_rate_state'    => '',
					'tax_rate'          => '',
					'tax_rate_name'     => '',
					'tax_rate_priority' => 1,
					'tax_rate_compound' => 0,
					'tax_rate_shipping' => 1,
					'tax_rate_order'    => null,
					'tax_rate_class'    => $current_class,
				),
				'strings'       => array(
					'no_rows_selected'        => __( 'No row(s) selected', 'kkart' ),
					'unload_confirmation_msg' => __( 'Your changed data will be lost if you leave this page without saving.', 'kkart' ),
					'csv_data_cols'           => array(
						__( 'Country code', 'kkart' ),
						__( 'State code', 'kkart' ),
						__( 'Postcode / ZIP', 'kkart' ),
						__( 'City', 'kkart' ),
						__( 'Rate %', 'kkart' ),
						__( 'Tax name', 'kkart' ),
						__( 'Priority', 'kkart' ),
						__( 'Compound', 'kkart' ),
						__( 'Shipping', 'kkart' ),
						__( 'Tax class', 'kkart' ),
					),
				),
			)
		);
		wp_enqueue_script( 'kkart-settings-tax' );

include __DIR__ . '/views/html-settings-tax.php';
	}

/**
	 * Get tax class being edited.
	 *
	 * @return string
	 */
	private static function get_current_tax_class() {
		global $current_section;

$tax_classes   = KKART_Tax::get_tax_classes();
		$current_class = '';

foreach ( $tax_classes as $class ) {
			if ( sanitize_title( $class ) === $current_section ) {
				$current_class = $class;
			}
		}

return $current_class;
	}

/**
	 * Get a posted tax rate.
	 *
	 * @param string $key   Key of tax rate in the post data array.
	 * @param int    $order Position/order of rate.
	 * @param string $class Tax class for rate.
	 * @return array
	 */
	private function get_posted_tax_rate( $key, $order, $class ) {
		$tax_rate      = array();
		$tax_rate_keys = array(
			'tax_rate_country',
			'tax_rate_state',
			'tax_rate',
			'tax_rate_name',
			'tax_rate_priority',
		);

foreach ( $tax_rate_keys as $tax_rate_key ) {
			if ( isset( $_POST[ $tax_rate_key ], $_POST[ $tax_rate_key ][ $key ] ) ) {
				$tax_rate[ $tax_rate_key ] = kkart_clean( wp_unslash( $_POST[ $tax_rate_key ][ $key ] ) );
			}
		}

$tax_rate['tax_rate_compound'] = isset( $_POST['tax_rate_compound'][ $key ] ) ? 1 : 0;
		$tax_rate['tax_rate_shipping'] = isset( $_POST['tax_rate_shipping'][ $key ] ) ? 1 : 0;
		$tax_rate['tax_rate_order']    = $order;
		$tax_rate['tax_rate_class']    = $class;

return $tax_rate;
	}

/**
	 * Save tax rates.
	 */
	public function save_tax_rates() {
		global $wpdb;

$current_class    = sanitize_title( $this->get_current_tax_class() );
		$posted_countries = kkart_clean( wp_unslash( $_POST['tax_rate_country'] ) );

// get the tax rate id of the first submited row.
		$first_tax_rate_id = key( $posted_countries );

// get the order position of the first tax rate id.
		$tax_rate_order = absint( $wpdb->get_var( $wpdb->prepare( "SELECT tax_rate_order FROM {$wpdb->prefix}kkart_tax_rates WHERE tax_rate_id = %s", $first_tax_rate_id ) ) );

$index = isset( $tax_rate_order ) ? $tax_rate_order : 0;

// Loop posted fields.
		foreach ( $posted_countries as $key => $value ) {
			$mode     = ( 0 === strpos( $key, 'new-' ) ) ? 'insert' : 'update';
			$tax_rate = $this->get_posted_tax_rate( $key, $index ++, $current_class );

if ( 'insert' === $mode ) {
				$tax_rate_id = KKART_Tax::_insert_tax_rate( $tax_rate );
			} elseif ( 1 === absint( $_POST['remove_tax_rate'][ $key ] ) ) {
				$tax_rate_id = absint( $key );
				KKART_Tax::_delete_tax_rate( $tax_rate_id );
				continue;
			} else {
				$tax_rate_id = absint( $key );
				KKART_Tax::_update_tax_rate( $tax_rate_id, $tax_rate );
			}

if ( isset( $_POST['tax_rate_postcode'][ $key ] ) ) {
				KKART_Tax::_update_tax_rate_postcodes( $tax_rate_id, kkart_clean( wp_unslash( $_POST['tax_rate_postcode'][ $key ] ) ) );
			}
			if ( isset( $_POST['tax_rate_city'][ $key ] ) ) {
				KKART_Tax::_update_tax_rate_cities( $tax_rate_id, kkart_clean( wp_unslash( $_POST['tax_rate_city'][ $key ] ) ) );
			}
		}
	}
}

return new KKART_Settings_Tax();