最后更新： 11/21-在WordPress 5.8.2中测试

代码进入函数。活动子主题（或活动主题）的php文件。

使用woocmerce\u product\u stock\u status\u options

而不是woocmerce\u product\u options\u stock\u status。

这样，您可以立即添加状态，而不是替换现有的下拉列表

同时使用woocommerce\u get\u availability\u text

这样您就不必再次添加现有状态

// Add new stock status options
function filter_woocommerce_product_stock_status_options( $status ) {
    // Add new statuses
    $status['pre_order'] = __( 'Pre order', 'woocommerce' );
    $status['contact_us'] = __( 'Contact us', 'woocommerce' );

    return $status;
}
add_filter( 'woocommerce_product_stock_status_options', 'filter_woocommerce_product_stock_status_options', 10, 1 );

// Availability text
function filter_woocommerce_get_availability_text( $availability, $product ) {
    // Get stock status
    switch( $product->get_stock_status() ) {
        case 'pre_order':
            $availability = __( 'Pre order', 'woocommerce' );
        break;
        case 'contact_us':
            $availability = __( 'Contact us', 'woocommerce' );
        break;
    }

    return $availability; 
}
add_filter( 'woocommerce_get_availability_text', 'filter_woocommerce_get_availability_text', 10, 2 );

// Availability CSS class
function filter_woocommerce_get_availability_class( $class, $product ) {
    // Get stock status
    switch( $product->get_stock_status() ) {
        case 'pre_order':
            $class = 'pre-order';
        break;
        case 'contact_us':
            $class = 'contact-us';
        break;
    }

    return $class;
}
add_filter( 'woocommerce_get_availability_class', 'filter_woocommerce_get_availability_class', 10, 2 );

使用woocommerce\u admin\u stock\u html在管理产品列表表上显示新库存状态

// Admin stock html
function filter_woocommerce_admin_stock_html( $stock_html, $product ) {
    // Simple
    if ( $product->is_type( 'simple' ) ) {
        // Get stock status
        $product_stock_status = $product->get_stock_status();
    // Variable
    } elseif ( $product->is_type( 'variable' ) ) {
        foreach( $product->get_visible_children() as $variation_id ) {
            // Get product
            $variation = wc_get_product( $variation_id );
            
            // Get stock status
            $product_stock_status = $variation->get_stock_status();
            
            /*
            Currently the status of the last variant in the loop will be displayed.
            
            So from here you need to add your own logic, depending on what you expect from your custom stock status.
            
            By default, for the existing statuses. The status displayed on the admin products list table for variable products is determined as:
            
            - Product should be in stock if a child is in stock.
            - Product should be out of stock if all children are out of stock.
            - Product should be on backorder if all children are on backorder.
            - Product should be on backorder if at least one child is on backorder and the rest are out of stock.
            */
        }
    }
    
    // Stock status
    switch( $product_stock_status ) {
        case 'pre_order':
            $stock_html = '<mark class="pre-order" style="background:transparent none;color:#33ccff;font-weight:700;line-height:1;">' . __( 'Pre order', 'woocommerce' ) . '</mark>';
        break;
        case 'contact_us':
            $stock_html = '<mark class="contact-us" style="background:transparent none;color:#cc33ff;font-weight:700;line-height:1;">' . __( 'Contact us', 'woocommerce' ) . '</mark>';
        break;
    }
 
    return $stock_html;
}
add_filter( 'woocommerce_admin_stock_html', 'filter_woocommerce_admin_stock_html', 10, 2 );

可选：如果需要，可以在钩子中使用自定义库存状态，在钩子中，您已经可以访问$Products对象，或者您可以使用global$Products。

// An example based on global $product
// Get the global product object
global $product;

// Is a WC product
if ( is_a( $product, 'WC_Product' ) ) {
    // Get stock status
    $product_stock_status = $product->get_stock_status();
    
    // Compare
    if ( $product_stock_status == 'My custom stock status' ) {
        // Etc..
    }
}

除了7uc1f3r提供的过滤器woocommerce_product_export_product_column_stock_status过滤器需要在出口产品CSV文件中显示自定义库存状态：

function add_custom_stock_csv_data( $_, $product ) {
  $status = $product->get_stock_status( 'edit' );
  switch( $status ) {
    case 'pre_order':
    case 'contact_us':
      return $status;
    case 'onbackorder':
      return 'backorder';
    case 'instock':
      return 1;
    default:
      return 0;
  }
}
add_filter( 'woocommerce_product_export_product_column_stock_status', 'add_custom_stock_csv_data', 10, 2 );