Relevanssi WooCommerce filter

relevanssi-woocommerce.php

<?php

// Add this to theme functions.php or in a code snippet:

add_filter( 'relevanssi_modify_wp_query', 'rlv_woocommerce_filters' );
function rlv_woocommerce_filters( $query ) {
	// phpcs:disable WordPress.Security.NonceVerification.Recommended

	$min_price = isset( $_REQUEST['min_price'] ) ? intval( $_REQUEST['min_price'] ) : false;
	$max_price = isset( $_REQUEST['max_price'] ) ? intval( $_REQUEST['max_price'] ) : false;

	$meta_query = $query->get( 'meta_query' );
	if ( $min_price ) {
		$meta_query[] = array(
			'key'     => '_price',
			'value'   => $min_price,
			'compare' => '>=',
			'type'    => 'NUMERIC',
		);
	}
	if ( $max_price ) {
		$meta_query[] = array(
			'key'     => '_price',
			'value'   => $max_price,
			'compare' => '<=',
			'type'    => 'NUMERIC',
		);
	}
	if ( $meta_query ) {
		$query->set( 'meta_query', $meta_query );
	}

	foreach ( array( 'product_tag', 'product_cat', 'product_brand' ) as $taxonomy ) {
		$value = isset( $_REQUEST[ $taxonomy ] ) ? intval( $_REQUEST[ $taxonomy ] ) : false;
		if ( $value ) {
			$tax_query   = $query->get( 'tax_query' );
			if ( ! is_array( $tax_query ) ) {
				$tax_query = array();
			}
			$tax_query[] = array(
				'taxonomy' => $taxonomy,
				'field'    => 'term_id',
				'terms'    => $value,
			);
			$query->set( 'tax_query', $tax_query );
		}
	}

	if ( 'no' === get_option( 'woocommerce_attribute_lookup_enabled' ) ) {
		return $query;
	}

	$chosen_attributes = array();

	if ( ! empty( $_GET ) ) {
		foreach ( $_GET as $key => $value ) {
			if ( 0 === strpos( $key, 'filter_' ) ) {
				$attribute    = wc_sanitize_taxonomy_name( str_replace( 'filter_', '', $key ) );
				$taxonomy     = wc_attribute_taxonomy_name( $attribute );
				$filter_terms = ! empty( $value ) ? explode( ',', wc_clean( wp_unslash( $value ) ) ) : array();

				if ( empty( $filter_terms ) || ! taxonomy_exists( $taxonomy ) || ! wc_attribute_taxonomy_id_by_name( $attribute ) ) {
					continue;
				}

				$query_type = ! empty( $_GET[ 'query_type_' . $attribute ] ) && in_array( $_GET[ 'query_type_' . $attribute ], array( 'and', 'or' ), true )
					? wc_clean( wp_unslash( $_GET[ 'query_type_' . $attribute ] ) )
					: '';

				$chosen_attributes[ $taxonomy ]['terms']      = array_map( 'sanitize_title', $filter_terms );
				$chosen_attributes[ $taxonomy ]['query_type'] = $query_type ? $query_type : apply_filters( 'woocommerce_layered_nav_default_query_type', 'and' );
			}
		}
	}

	$tax_query = $query->get( 'tax_query' );
	if ( ! is_array( $tax_query ) ) {
		$tax_query = array();
	}
	foreach ( $chosen_attributes as $taxonomy => $data ) {
		$tax_query[] = array(
			'taxonomy'         => $taxonomy,
			'field'            => 'slug',
			'terms'            => $data['terms'],
			'operator'         => 'and' === $data['query_type'] ? 'AND' : 'IN',
			'include_children' => false,
		);
	}
	if ( ! empty( $tax_query ) ) {
		$query->set( 'tax_query', $tax_query );
	}

	return $query;
}