надо усовершенствовать, товары с валютой конверсия

//Для простых товаров поля и сохранение
function wc_uahprice_product_field() {
woocommerce_wp_text_input( array( 'id' => '_uah_price', 'class' => 'wc_input_price short', 'label' => __( 'UAH', 'woocommerce' ) ) );
woocommerce_wp_text_input( array( 'id' => '_usd_price', 'class' => 'wc_input_price short', 'label' => __( 'USD', 'woocommerce' ) ) );
woocommerce_wp_text_input( array( 'id' => '_euro_price', 'class' => 'wc_input_price short', 'label' => __( 'EUR', 'woocommerce' ) ) );  
}
add_action( 'woocommerce_product_options_pricing', 'wc_uahprice_product_field' );


function wc_myprice_save_product( $product_id ) {

if ( ( $_POST['_uah_price'] ) ) {
if ( is_numeric( $_POST['_uah_price'] ) )
update_post_meta( $product_id, '_uah_price', $_POST['_uah_price'] );
} else delete_post_meta( $product_id, '_uah_price' );

if ( ( $_POST['_usd_price'] ) ) {
if ( is_numeric( $_POST['_usd_price'] ) )
update_post_meta( $product_id, '_usd_price', $_POST['_usd_price'] );
} else delete_post_meta( $product_id, '_usd_price' );

if ( ( $_POST['_euro_price'] ) ) {
if ( is_numeric( $_POST['_euro_price'] ) )
update_post_meta( $product_id, '_euro_price', $_POST['_euro_price'] );
} else delete_post_meta( $product_id, '_euro_price' );

$UAH = get_post_meta( $product_id, '_uah_price', true );
$USD = get_post_meta( $product_id, '_usd_price', true );
$EUR = get_post_meta( $product_id, '_euro_price', true );
  
if(get_option( '_curr_date_upd') != date('l jS F Y')){ 
    $url = 'https://api.privatbank.ua/p24api/pubinfo?json&exchange&coursid=4'; 
	$ch = curl_init();
	curl_setopt($ch, CURLOPT_AUTOREFERER, TRUE);
	curl_setopt($ch, CURLOPT_HEADER, 0);
	curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
	curl_setopt($ch, CURLOPT_URL, $url);
	@curl_setopt($ch, CURLOPT_FOLLOWLOCATION, TRUE);
	$res = curl_exec($ch);
	curl_close($ch);
    $currency_data = json_decode($res, true);
        $rates = array();
  		if (!empty($currency_data)) {
		    foreach ($currency_data as $c) {
			if ($c['base_ccy'] == 'UAH') {
			    $rates[$c['ccy']] = floatval($c['sale']);
			}
		    }
		}
$dollar = $rates['USD'];
$euro = $rates['EUR'];
update_option( '_curr_usdd', $dollar );  
update_option( '_curr_euro', $euro );
update_option('_curr_date_upd', date('l jS F Y'));  
} else{
  $dollar = get_option( '_curr_usdd');
  $euro = get_option( '_curr_euro');
}
  
if (($UAH != "") && ($UAH != 0)) {
	$custom_price = $UAH;
}
if (($USD != "") && ($USD != 0)) {
	$custom_price = $USD * $dollar;
}
if (($EUR != "") && ($EUR != 0)) {
	$custom_price = $EUR * $euro;
}
  
$custom_price = round($custom_price, 2); // округляем до сотых, чтобы в regular_price не записывались огромные дроби
$regular_price = get_post_meta($post->ID, '_price', true); //получаем текущую цену товара

update_post_meta( $product_id, '_regular_price', (float)$custom_price );
update_post_meta( $product_id, '_price', (float)$custom_price );	
}
add_action( 'save_post', 'wc_myprice_save_product' );


//Для ввариативных товаров поля и сохранение
add_action( 'woocommerce_product_after_variable_attributes', 'variation_settings_fields', 10, 3 );
add_action( 'woocommerce_save_product_variation', 'save_variation_settings_fields', 10, 2 );
function variation_settings_fields( $loop, $variation_data, $variation ) {
	woocommerce_wp_text_input( 
		array( 
			'id'          => '_uah_price[' . $variation->ID . ']', 
			'label'       => __( 'UAH', 'woocommerce' ), 
			'desc_tip'    => 'false',
			'description' => __( 'Enter the custom number here.', 'woocommerce' ),
			'value'       => get_post_meta( $variation->ID, '_uah_price', true ),
			'custom_attributes' => array(
							'step' 	=> 'any',
							'min'	=> '0'
						) 
		)
	);
	woocommerce_wp_text_input( 
		array( 
			'id'          => '_usd_price[' . $variation->ID . ']', 
			'label'       => __( 'USD', 'woocommerce' ), 
			'desc_tip'    => 'true',
			'description' => __( 'Enter the custom number here.', 'woocommerce' ),
			'value'       => get_post_meta( $variation->ID, '_usd_price', true ),
			'custom_attributes' => array(
							'step' 	=> 'any',
							'min'	=> '0'
						) 
		)
	);
	woocommerce_wp_text_input( 
		array( 
			'id'          => '_euro_price[' . $variation->ID . ']', 
			'label'       => __( 'EUR', 'woocommerce' ), 
			'desc_tip'    => 'true',
			'description' => __( 'Enter the custom number here.', 'woocommerce' ),
			'value'       => get_post_meta( $variation->ID, '_euro_price', true ),
			'custom_attributes' => array(
							'step' 	=> 'any',
							'min'	=> '0'
						) 
		)
	);  
}

function save_variation_settings_fields( $post_id ) {
	$number_field = $_POST['_uah_price'][ $post_id ];
	if( ! empty( $number_field ) ) {
		update_post_meta( $post_id, '_uah_price', esc_attr( $number_field ) );
	}else delete_post_meta( $post_id, '_uah_price' );
  	$number_field = $_POST['_usd_price'][ $post_id ];
	if( ! empty( $number_field ) ) {
		update_post_meta( $post_id, '_usd_price', esc_attr( $number_field ) );
	}else delete_post_meta( $post_id, '_usd_price' );
  	$number_field = $_POST['_euro_price'][ $post_id ];
	if( ! empty( $number_field ) ) {
		update_post_meta( $post_id, '_euro_price', esc_attr( $number_field ) );
	}else delete_post_meta( $post_id, '_euro_price' );
  
$UAH = get_post_meta( $post_id, '_uah_price', true );
$USD = get_post_meta( $post_id, '_usd_price', true );
$EUR = get_post_meta( $post_id, '_euro_price', true );

if(get_option( '_curr_date_upd') != date('l jS F Y')){ 
    $url = 'https://api.privatbank.ua/p24api/pubinfo?json&exchange&coursid=4'; 
	$ch = curl_init();
	curl_setopt($ch, CURLOPT_AUTOREFERER, TRUE);
	curl_setopt($ch, CURLOPT_HEADER, 0);
	curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
	curl_setopt($ch, CURLOPT_URL, $url);
	@curl_setopt($ch, CURLOPT_FOLLOWLOCATION, TRUE);
	$res = curl_exec($ch);
	curl_close($ch);
    $currency_data = json_decode($res, true);
        $rates = array();
  		if (!empty($currency_data)) {
		    foreach ($currency_data as $c) {
			if ($c['base_ccy'] == 'UAH') {
			    $rates[$c['ccy']] = floatval($c['sale']);
			}
		    }
		}
$dollar = $rates['USD'];
$euro = $rates['EUR'];
update_option( '_curr_usdd', $dollar );  
update_option( '_curr_euro', $euro );
update_option('_curr_date_upd', date('l jS F Y'));  
} else{
  $dollar = get_option( '_curr_usdd');
  $euro = get_option( '_curr_euro');
}
  
if (($UAH != "") && ($UAH != 0)) {
	$custom_price = $UAH;
}
if (($USD != "") && ($USD != 0)) {
	$custom_price = $USD * $dollar;
}
if (($EUR != "") && ($EUR != 0)) {
	$custom_price = $EUR * $euro;
}
  
$custom_price = round($custom_price, 2); // округляем до сотых, чтобы в regular_price не записывались огромные дроби

update_post_meta( $post_id, '_regular_price', (float)$custom_price );
update_post_meta( $post_id, '_price', (float)$custom_price );	  
}

// Add a new interval of a week
add_filter( 'cron_schedules', 'myprefix_add_weekly_cron_schedule' );
function myprefix_add_weekly_cron_schedule( $schedules ) {
    $schedules['weekly'] = array(
        'interval' => 86400, // 1 day in seconds
        'display'  => __( 'Once Daily' ),
    );
 
    return $schedules;
}
 
// Schedule an action if it's not already scheduled
if ( ! wp_next_scheduled( 'myprefix_my_cron_action' ) ) {
    wp_schedule_event( time(), 'weekly', 'myprefix_my_cron_action' );
}
 
// Hook into that action that'll fire weekly
add_action( 'myprefix_my_cron_action', 'myprefix_function_to_run' );
function myprefix_function_to_run() {
if(get_option( '_curr_date_upd') != date('l jS F Y')){ 
    $url = 'https://api.privatbank.ua/p24api/pubinfo?json&exchange&coursid=4'; 
	$ch = curl_init();
	curl_setopt($ch, CURLOPT_AUTOREFERER, TRUE);
	curl_setopt($ch, CURLOPT_HEADER, 0);
	curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
	curl_setopt($ch, CURLOPT_URL, $url);
	@curl_setopt($ch, CURLOPT_FOLLOWLOCATION, TRUE);
	$res = curl_exec($ch);
	curl_close($ch);
    $currency_data = json_decode($res, true);
        $rates = array();
  		if (!empty($currency_data)) {
		    foreach ($currency_data as $c) {
			if ($c['base_ccy'] == 'UAH') {
			    $rates[$c['ccy']] = floatval($c['sale']);
			}
		    }
		}
$dollar = $rates['USD'];
$euro = $rates['EUR'];
update_option( '_curr_usdd', $dollar );  
update_option( '_curr_euro', $euro );
update_option('_curr_date_upd', date('l jS F Y'));  
} else{
  $dollar = get_option( '_curr_usdd');
  $euro = get_option( '_curr_euro');
}  
$args = array(
    'posts_per_page'   => -1,
    'post_type'        => 'product'
);
    $loop = new WP_Query( $args );
    if ( $loop->have_posts() ): while ( $loop->have_posts() ): $loop->the_post();
        global $product;
        global $post;
        $UAH = get_post_meta( $product->get_id(), '_uah_price', true );
        $USD = get_post_meta( $product->get_id(), '_usd_price', true );
        $EUR = get_post_meta( $product->get_id(), '_euro_price', true );
        $custom_price = 0;
        if (($UAH != "") && ($UAH != 0)) {
            $custom_price = $UAH;
        }
        if (($USD != "") && ($USD != 0)) {
            $custom_price = $USD * $dollar;
        }
        if (($EUR != "") && ($EUR != 0)) {
            $custom_price = $EUR * $euro;
        }

        $custom_price = round($custom_price, 2); // округляем до сотых, чтобы в regular_price не записывались огромные дроби 
        update_post_meta( $product->get_id(), '_regular_price', (float)$custom_price );
        update_post_meta( $product->get_id(), '_price', (float)$custom_price );	
if( $product->is_type('variable') ){
    foreach( $product->get_available_variations() as $variation_values ){
        $variation_id = $variation_values['variation_id']; // variation id
        $UAH = get_post_meta( $variation_id, '_uah_price', true );
        $USD = get_post_meta( $variation_id, '_usd_price', true );
        $EUR = get_post_meta( $variation_id, '_euro_price', true );
        $custom_price = 0;
        if (($UAH != "") && ($UAH != 0)) {
            $custom_price = $UAH;
        }
        if (($USD != "") && ($USD != 0)) {
            $custom_price = $USD * $dollar;
        }
        if (($EUR != "") && ($EUR != 0)) {
            $custom_price = $EUR * $euro;
        }
        $custom_price = round($custom_price, 2); // округляем до сотых, чтобы в regular_price не записывались огромные дроби       
        // Updating active price and regular price
        update_post_meta( $variation_id, '_regular_price', $custom_price );
        update_post_meta( $variation_id, '_price', $custom_price );
        wc_delete_product_transients( $variation_id ); // Clear/refresh the variation cache
    }
    // Clear/refresh the variable product cache
    wc_delete_product_transients( $post->ID );
}  
    endwhile; endif;
}