PHP

php Change the WooCommerce loop product link based on a custom field

function action_woocommerce_product_options_advanced() {  
    woocommerce_wp_text_input( 
        array( 
            'id'          => '_custom_url', 
            'label'       => __( 'Custom Page link', 'actions-pro' ), 
            'placeholder' => 'http://',
            'desc_tip'    => 'true',
            'description' => __( 'Enter the custom product page url for this product to link to from the shop page.', 'actions-pro' ) 
        )
    );
}
add_action( 'woocommerce_product_options_advanced', 'action_woocommerce_product_options_advanced' );

// Save custom field
function action_woocommerce_admin_process_product_object( $product ) {
    // Isset
    if ( isset( $_POST['_custom_url'] ) ) {        
        // Update
        $product->update_meta_data( '_custom_url', sanitize_url( $_POST['_custom_url'] ) );
    }
}
add_action( 'woocommerce_admin_process_product_object', 'action_woocommerce_admin_process_product_object', 10, 1 );

// Custom url
function filter_woocommerce_loop_product_link( $the_permalink, $product ) {
    // Get meta value
    $url = $product->get_meta( '_custom_url' );

    // NOT empty
    if ( ! empty ( $url ) ) {
        $the_permalink = $url;
    }

    return $the_permalink;