我在WooCommerce库存选项卡中添加了一个下拉列表，用户可以在其中选择要在前端显示的消息。

在函数中。php：

// Display Fields in Back End
add_action( \'woocommerce_product_options_inventory_product_data\', \'woo_add_custom_status_fields\' );

function woo_add_custom_status_fields() {

global $woocommerce, $post;
// Add Select to WooCommerce Inventory Tab in Back End
woocommerce_wp_select( 
    array( 
        \'id\'      => \'productstatus_select\',
        \'label\'   => __( \'Product Status\', \'woocommerce\' ),
        \'options\' => array(
            \'Message one\'   => __( \'The message\', \'woocommerce\' ),
            \'Message two\'   => __( \'The message\', \'woocommerce\' ),
            \'Message three\'   => __( \'The message\', \'woocommerce\' ),
            )
        )
    );
}

// Save Fields
add_action( \'woocommerce_process_product_meta\', \'woo_add_custom_status_fields_save\' );

function woo_add_custom_status_fields_save( $post_id ){
    $woocommerce_select = $_POST[\'productstatus_select\'];
        if( !empty( $woocommerce_select ) )
    update_post_meta( $post_id, \'productstatus_select\', esc_attr( $woocommerce_select ) );
}

在woocommerce/single product/meta中使用以下代码检索所选值。php

    <?php
    // Display Custom Field Value in Front End
    echo \'<p class="productstatus">\' . get_post_meta( $post->ID, \'productstatus_select\', true ) .\'</p>\';
    ?>

现在，我想知道是否有可能将不同的类分配给不同的选择，以便我可以对输出的代码进行样式化。例如，在前端将消息一设为红色，消息二设为绿色，等等。我不确定这些选项是否应该是数组，或者我是否需要一个额外的函数来实现这一点。非常感谢您的任何建议。

$colors_stings = array(
    \'Message one\' => \'message_color_green\',
    \'Message two\'   => \'message_color_red\',
    \'Message three\' => \'message_color_blue\'
);

$css_class = isset($colors_stings[$product_status]) ? $colors_stings[$product_status] : \'message_default_color\';

$colors_stings = array(
    \'Message one\' => \'message_color_green\',
    \'Message two\'   => \'message_color_red\',
    \'Message three\' => \'message_color_blue\'
);

$product_status = get_post_meta( $post->ID, \'productstatus_select\', true );
$css_class = isset($colors_stings[$product_status]) ? $colors_stings[$product_status] : \'message_default_color\';

echo \'<p class="productstatus \'. $css_class . \'">\' . $product_status .\'</p>\';

woocommerce_wp_select( 
    array( 
        \'id\'      => \'productstatus_select\',
        \'label\'   => __( \'Product Status\', \'woocommerce\' ),
        \'options\' => array(
            \'Message one\'   => sprintf( 
                \'<span class="message--important">%s</span>\', 
                __( \'The message\', \'woocommerce\' ) 
            ),
            \'Message two\'   => \'<span class="foo__bar">\'.__( \'The message\', \'woocommerce\' ).\'</span>\',
            \'Message three\' => \'<em>\'.__( \'The message\', \'woocommerce\' ).\'</em>\',
            )
        )
    );
}