Fixes WooCommerce price filter widget max price issue

woo-price-filter-widget-fix.php

// Override the woocommerce default filter for getting max price for filter widget.
add_filter( 'woocommerce_price_filter_widget_max_amount', 'theme_woocommerce_price_filter_widget_max_amount', 10, 2 );

/**
 * Fix max_price issue in price filter widget.
 *
 * @param int $max_price The price filter form max_price.
 * @return int Max price for the filter.
 */
function theme_woocommerce_price_filter_widget_max_amount( $max_price ) {
	$prices = theme_woocommerce_get_filtered_price();
	$max_price = $prices->max_price;
	return $max_price;
}

/**
 * Gets and returns the min and max prices from database. WooCommerce filter function.
 *
 * @return object Min and Max prices from database.
 */
function theme_woocommerce_get_filtered_price() {
	global $wpdb, $wp_the_query;
	$args       = $wp_the_query->query_vars;
	$tax_query  = isset( $args['tax_query'] ) ? $args['tax_query'] : array();
	$meta_query = isset( $args['meta_query'] ) ? $args['meta_query'] : array();
	if ( ! empty( $args['taxonomy'] ) && ! empty( $args['term'] ) ) {
		$tax_query[] = array(
			'taxonomy' => $args['taxonomy'],
			'terms'    => array( $args['term'] ),
			'field'    => 'slug',
		);
	}
	foreach ( $meta_query as $key => $query ) {
		if ( ! empty( $query['price_filter'] ) || ! empty( $query['rating_filter'] ) ) {
			unset( $meta_query[ $key ] );
		}
	}
	$meta_query = new WP_Meta_Query( $meta_query );
	$tax_query  = new WP_Tax_Query( $tax_query );
	$meta_query_sql = $meta_query->get_sql( 'post', $wpdb->posts, 'ID' );
	$tax_query_sql  = $tax_query->get_sql( $wpdb->posts, 'ID' );
	$sql  = "SELECT min( FLOOR( price_meta.meta_value ) ) as min_price, max( CEILING( price_meta.meta_value ) ) as max_price FROM {$wpdb->posts} ";
	$sql .= " LEFT JOIN {$wpdb->postmeta} as price_meta ON {$wpdb->posts}.ID = price_meta.post_id " . $tax_query_sql['join'] . $meta_query_sql['join'];
	$sql .= " 	WHERE {$wpdb->posts}.post_type IN ('" . implode( "','", array_map( 'esc_sql', apply_filters( 'woocommerce_price_filter_post_type', array( 'product' ) ) ) ) . "')
				AND {$wpdb->posts}.post_status = 'publish'
				AND price_meta.meta_key IN ('" . implode( "','", array_map( 'esc_sql', apply_filters( 'woocommerce_price_filter_meta_keys', array( '_price' ) ) ) ) . "')
				AND price_meta.meta_value > '' ";
	$sql .= $tax_query_sql['where'] . $meta_query_sql['where'];
	return $wpdb->get_row( $sql );
}