在电子商务运营中，成本核算是至关重要的环节。对于使用WordPress搭建的电商网站，特别是处理小批量定制产品的商家，实时核算成本能帮助您更精准地定价、控制利润。本教程将指导您开发一个WordPress插件，实现小批量定制产品的成本实时核算功能。

我们的插件将实现以下核心功能：

1. 在商品编辑页面添加成本核算字段
2. 根据用户选择的定制选项实时计算成本
3. 在前端产品页面显示实时成本估算
4. 管理员后台查看成本分析报告

首先，我们创建插件的基本文件结构：

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wp-content/plugins/cost-calculator/
├── cost-calculator.php
├── includes/
│   ├── admin/
│   │   ├── class-admin-settings.php
│   │   └── class-product-metabox.php
│   ├── frontend/
│   │   ├── class-frontend-display.php
│   │   └── class-ajax-handler.php
│   └── class-cost-calculator.php
├── assets/
│   ├── css/
│   │   └── style.css
│   └── js/
│       └── script.js
└── README.md

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<?php
/**
 * Plugin Name: 小批量定制成本核算器
 * Plugin URI: https://yourwebsite.com/
 * Description: 为WordPress小批量定制产品提供实时成本核算功能
 * Version: 1.0.0
 * Author: 您的名称
 * License: GPL v2 or later
 * Text Domain: cost-calculator
 */

// 防止直接访问
if (!defined('ABSPATH')) {
    exit;
}

// 定义插件常量
define('COST_CALCULATOR_VERSION', '1.0.0');
define('COST_CALCULATOR_PLUGIN_DIR', plugin_dir_path(__FILE__));
define('COST_CALCULATOR_PLUGIN_URL', plugin_dir_url(__FILE__));

// 自动加载类文件
spl_autoload_register(function ($class_name) {
    $prefix = 'Cost_Calculator_';
    $base_dir = COST_CALCULATOR_PLUGIN_DIR . 'includes/';
    
    // 检查类是否使用我们的命名空间前缀
    $len = strlen($prefix);
    if (strncmp($prefix, $class_name, $len) !== 0) {
        return;
    }
    
    // 获取相对类名
    $relative_class = substr($class_name, $len);
    
    // 将命名空间分隔符替换为目录分隔符
    $file = $base_dir . str_replace('_', '/', $relative_class) . '.php';
    
    // 如果文件存在，则加载它
    if (file_exists($file)) {
        require $file;
    }
});

// 初始化插件
function cost_calculator_init() {
    // 检查WooCommerce是否激活
    if (!class_exists('WooCommerce')) {
        add_action('admin_notices', function() {
            echo '<div class="notice notice-error"><p>';
            echo __('成本核算插件需要WooCommerce支持，请先安装并激活WooCommerce插件。', 'cost-calculator');
            echo '</p></div>';
        });
        return;
    }
    
    // 初始化主类
    $plugin = new Cost_Calculator_Main();
    $plugin->run();
}
add_action('plugins_loaded', 'cost_calculator_init');

// 插件激活时的操作
register_activation_hook(__FILE__, 'cost_calculator_activate');
function cost_calculator_activate() {
    // 创建必要的数据库表
    global $wpdb;
    $charset_collate = $wpdb->get_charset_collate();
    $table_name = $wpdb->prefix . 'cost_calculator_logs';
    
    $sql = "CREATE TABLE IF NOT EXISTS $table_name (
        id mediumint(9) NOT NULL AUTO_INCREMENT,
        product_id mediumint(9) NOT NULL,
        base_cost decimal(10,2) NOT NULL,
        material_cost decimal(10,2) NOT NULL,
        labor_cost decimal(10,2) NOT NULL,
        additional_cost decimal(10,2) NOT NULL,
        total_cost decimal(10,2) NOT NULL,
        quantity int(11) NOT NULL,
        calculated_at datetime DEFAULT CURRENT_TIMESTAMP,
        PRIMARY KEY (id)
    ) $charset_collate;";
    
    require_once(ABSPATH . 'wp-admin/includes/upgrade.php');
    dbDelta($sql);
    
    // 设置默认选项
    add_option('cost_calculator_version', COST_CALCULATOR_VERSION);
    add_option('cost_calculator_profit_margin', '30'); // 默认利润率30%
}

// 插件停用时的清理操作
register_deactivation_hook(__FILE__, 'cost_calculator_deactivate');
function cost_calculator_deactivate() {
    // 清理临时数据，保留日志表
    delete_option('cost_calculator_temp_data');
}
?>

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<?php
// includes/admin/class-product-metabox.php

class Cost_Calculator_Product_Metabox {
    
    public function __construct() {
        add_action('add_meta_boxes', array($this, 'add_cost_metabox'));
        add_action('save_post_product', array($this, 'save_cost_data'));
    }
    
    // 添加成本核算元数据框
    public function add_cost_metabox() {
        add_meta_box(
            'cost_calculator_metabox',
            __('成本核算设置', 'cost-calculator'),
            array($this, 'render_metabox'),
            'product',
            'side',
            'high'
        );
    }
    
    // 渲染元数据框内容
    public function render_metabox($post) {
        // 添加安全验证
        wp_nonce_field('cost_calculator_save_data', 'cost_calculator_nonce');
        
        // 获取现有值
        $base_cost = get_post_meta($post->ID, '_base_cost', true);
        $material_options = get_post_meta($post->ID, '_material_options', true);
        $labor_cost_per_unit = get_post_meta($post->ID, '_labor_cost_per_unit', true);
        
        // 解析材料选项
        $materials = $material_options ? json_decode($material_options, true) : array();
        
        ?>
        <div class="cost-calculator-fields">
            <p>
                <label for="base_cost"><?php _e('基础成本 (元):', 'cost-calculator'); ?></label>
                <input type="number" step="0.01" min="0" id="base_cost" 
                       name="base_cost" value="<?php echo esc_attr($base_cost); ?>" 
                       style="width: 100%;">
            </p>
            
            <p>
                <label for="labor_cost_per_unit"><?php _e('单位人工成本 (元):', 'cost-calculator'); ?></label>
                <input type="number" step="0.01" min="0" id="labor_cost_per_unit" 
                       name="labor_cost_per_unit" value="<?php echo esc_attr($labor_cost_per_unit); ?>" 
                       style="width: 100%;">
            </p>
            
            <hr>
            
            <h4><?php _e('材料选项', 'cost-calculator'); ?></h4>
            <div id="material-options-container">
                <?php if (!empty($materials)): ?>
                    <?php foreach ($materials as $index => $material): ?>
                        <div class="material-option">
                            <input type="text" name="material_names[]" 
                                   value="<?php echo esc_attr($material['name']); ?>" 
                                   placeholder="材料名称" style="width: 48%;">
                            <input type="number" step="0.01" min="0" 
                                   name="material_costs[]" 
                                   value="<?php echo esc_attr($material['cost']); ?>" 
                                   placeholder="成本" style="width: 48%;">
                        </div>
                    <?php endforeach; ?>
                <?php else: ?>
                    <div class="material-option">
                        <input type="text" name="material_names[]" 
                               placeholder="材料名称" style="width: 48%;">
                        <input type="number" step="0.01" min="0" 
                               name="material_costs[]" 
                               placeholder="成本" style="width: 48%;">
                    </div>
                <?php endif; ?>
            </div>
            
            <button type="button" id="add-material-option" class="button">
                <?php _e('添加材料选项', 'cost-calculator'); ?>
            </button>
            
            <script>
            jQuery(document).ready(function($) {
                $('#add-material-option').click(function() {
                    $('#material-options-container').append(
                        '<div class="material-option" style="margin-top: 5px;">' +
                        '<input type="text" name="material_names[]" placeholder="材料名称" style="width: 48%;">' +
                        '<input type="number" step="0.01" min="0" name="material_costs[]" placeholder="成本" style="width: 48%;">' +
                        '</div>'
                    );
                });
            });
            </script>
        </div>
        <?php
    }
    
    // 保存成本数据
    public function save_cost_data($post_id) {
        // 检查非ce、自动保存和用户权限
        if (!isset($_POST['cost_calculator_nonce']) ||
            !wp_verify_nonce($_POST['cost_calculator_nonce'], 'cost_calculator_save_data') ||
            defined('DOING_AUTOSAVE') && DOING_AUTOSAVE ||
            !current_user_can('edit_post', $post_id)) {
            return;
        }
        
        // 保存基础成本
        if (isset($_POST['base_cost'])) {
            update_post_meta($post_id, '_base_cost', sanitize_text_field($_POST['base_cost']));
        }
        
        // 保存人工成本
        if (isset($_POST['labor_cost_per_unit'])) {
            update_post_meta($post_id, '_labor_cost_per_unit', 
                           sanitize_text_field($_POST['labor_cost_per_unit']));
        }
        
        // 保存材料选项
        if (isset($_POST['material_names']) && isset($_POST['material_costs'])) {
            $materials = array();
            $names = $_POST['material_names'];
            $costs = $_POST['material_costs'];
            
            for ($i = 0; $i < count($names); $i++) {
                if (!empty($names[$i]) && !empty($costs[$i])) {
                    $materials[] = array(
                        'name' => sanitize_text_field($names[$i]),
                        'cost' => floatval($costs[$i])
                    );
                }
            }
            
            update_post_meta($post_id, '_material_options', json_encode($materials));
        }
    }
}
?>

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<?php
// includes/frontend/class-frontend-display.php

class Cost_Calculator_Frontend_Display {
    
    public function __construct() {
        add_action('woocommerce_before_add_to_cart_button', array($this, 'display_cost_calculator'));
        add_action('wp_enqueue_scripts', array($this, 'enqueue_scripts'));
    }
    
    // 在前端产品页面显示成本计算器
    public function display_cost_calculator() {
        global $product;
        
        if (!$product || !$product->is_type('simple')) {
            return;
        }
        
        $product_id = $product->get_id();
        $base_cost = get_post_meta($product_id, '_base_cost', true);
        $labor_cost = get_post_meta($product_id, '_labor_cost_per_unit', true);
        $material_options = get_post_meta($product_id, '_material_options', true);
        $materials = $material_options ? json_decode($material_options, true) : array();
        
        if (empty($base_cost) && empty($labor_cost) && empty($materials)) {
            return;
        }
        
        ?>
        <div class="cost-calculator-container" style="margin: 20px 0; padding: 15px; border: 1px solid #ddd; border-radius: 5px;">
            <h3><?php _e('成本估算器', 'cost-calculator'); ?></h3>
            
            <div class="calculator-fields">
                <!-- 数量选择 -->
                <div class="form-row">
                    <label for="quantity"><?php _e('数量:', 'cost-calculator'); ?></label>
                    <input type="number" id="cost-quantity" name="cost_quantity" 
                           min="1" max="100" value="1" style="width: 80px;">
                </div>
                
                <!-- 材料选择 -->
                <?php if (!empty($materials)): ?>
                <div class="form-row">
                    <label for="material-select"><?php _e('选择材料:', 'cost-calculator'); ?></label>
                    <select id="material-select" name="cost_material" style="width: 200px;">
                        <option value="0"><?php _e('-- 请选择 --', 'cost-calculator'); ?></option>
                        <?php foreach ($materials as $index => $material): ?>
                        <option value="<?php echo esc_attr($material['cost']); ?>" 
                                data-index="<?php echo $index; ?>">
                            <?php echo esc_html($material['name']); ?> 
                            (<?php echo wc_price($material['cost']); ?>)
                        </option>
                        <?php endforeach; ?>
                    </select>
                </div>
                <?php endif; ?>
                
                <!-- 额外成本 -->
                <div class="form-row">
                    <label for="additional-cost"><?php _e('额外成本 (元):', 'cost-calculator'); ?></label>
                    <input type="number" id="additional-cost" name="additional_cost" 
                           step="0.01" min="0" value="0" style="width: 100px;">
                    <small><?php _e('如包装、特殊处理等', 'cost-calculator'); ?></small>
                </div>
                
                <!-- 计算结果 -->
                <div class="cost-result" style="margin-top: 15px; padding: 10px; background-color: #f8f9fa; border-radius: 3px;">
                    <h4><?php _e('成本估算结果:', 'cost-calculator'); ?></h4>
                    <div id="cost-breakdown">
                        <p><?php _e('请选择选项以查看成本估算', 'cost-calculator'); ?></p>
                    </div>
                    <div id="total-cost" style="font-weight: bold; font-size: 1.2em; color: #d35400;"></div>
                </div>
                
                <!-- 隐藏字段存储产品数据 -->
                <input type="hidden" id="product-base-cost" value="<?php echo esc_attr($base_cost); ?>">
                <input type="hidden" id="product-labor-cost" value="<?php echo esc_attr($labor_cost); ?>">
            </div>
        </div>
        
        <script type="text/javascript">
        jQuery(document).ready(function($) {
            // 获取利润率设置
            var profitMargin = <?php echo get_option('cost_calculator_profit_margin', '30'); ?>;
            
            // 计算成本函数
            function calculateCost() {
                var quantity = parseInt($('#cost-quantity').val()) || 1;
                var baseCost = parseFloat($('#product-base-cost').val()) || 0;
                var laborCost = parseFloat($('#product-labor-cost').val()) || 0;
                var materialCost = parseFloat($('#material-select').val()) || 0;
                var additionalCost = parseFloat($('#additional-cost').val()) || 0;
                
                // 计算各项成本
                var totalBaseCost = baseCost * quantity;
                var totalLaborCost = laborCost * quantity;
                var totalMaterialCost = materialCost * quantity;
                var totalAdditionalCost = additionalCost;
                
                // 总成本
                var totalCost = totalBaseCost + totalLaborCost + totalMaterialCost + totalAdditionalCost;
                
                // 建议售价（包含利润）
                var suggestedPrice = totalCost * (1 + profitMargin / 100);
                
                // 更新显示
                $('#cost-breakdown').html(
                    '<p>基础成本: ' + totalBaseCost.toFixed(2) + ' 元</p>' +
                    '<p>人工成本: ' + totalLaborCost.toFixed(2) + ' 元</p>' +
                    '<p>材料成本: ' + totalMaterialCost.toFixed(2) + ' 元</p>' +
                    '<p>额外成本: ' + totalAdditionalCost.toFixed(2) + ' 元</p>'
                );
                
                $('#total-cost').html(
                    '总成本: ' + totalCost.toFixed(2) + ' 元<br>' +
                    '建议售价 (利润率 ' + profitMargin + '%): ' + suggestedPrice.toFixed(2) + ' 元'
                );
                
                // 保存计算记录到数据库
                saveCostCalculation({
                    product_id: <?php echo $product_id; ?>,
                    base_cost: baseCost,
                    labor_cost: laborCost,
                    material_cost: materialCost,
                    additional_cost: additionalCost,
                    total_cost: totalCost,
                    quantity: quantity
                });
            }
            
            // 保存计算记录到数据库
            function saveCostCalculation(data) {
                $.ajax({
                    url: '<?php echo admin_url('admin-ajax.php'); ?>',
                    type: 'POST',
                    data: {
                        action: 'save_cost_calculation',
                        nonce: '<?php echo wp_create_nonce('cost_calculator_ajax'); ?>',
                        calculation_data: data
                    }
                });
            }
            
            // 绑定事件监听

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        // 页面加载时计算一次
        calculateCost();
    });
    </script>
    <?php
}

// 加载前端脚本和样式
public function enqueue_scripts() {
    if (is_product()) {
        wp_enqueue_style(
            'cost-calculator-frontend',
            COST_CALCULATOR_PLUGIN_URL . 'assets/css/style.css',
            array(),
            COST_CALCULATOR_VERSION
        );
        
        wp_enqueue_script(
            'cost-calculator-frontend',
            COST_CALCULATOR_PLUGIN_URL . 'assets/js/script.js',
            array('jquery'),
            COST_CALCULATOR_VERSION,
            true
        );
        
        // 传递数据到JavaScript
        wp_localize_script('cost-calculator-frontend', 'costCalculator', array(
            'ajax_url' => admin_url('admin-ajax.php'),
            'nonce' => wp_create_nonce('cost_calculator_frontend')
        ));
    }
}

}
?>

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## AJAX处理程序

<?php
// includes/frontend/class-ajax-handler.php

class Cost_Calculator_Ajax_Handler {

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public function __construct() {
    add_action('wp_ajax_save_cost_calculation', array($this, 'save_calculation'));
    add_action('wp_ajax_nopriv_save_cost_calculation', array($this, 'save_calculation'));
    add_action('wp_ajax_get_cost_report', array($this, 'get_cost_report'));
}

// 保存成本计算记录
public function save_calculation() {
    // 验证nonce
    if (!wp_verify_nonce($_POST['nonce'], 'cost_calculator_ajax')) {
        wp_die('安全验证失败');
    }
    
    global $wpdb;
    $table_name = $wpdb->prefix . 'cost_calculator_logs';
    
    $data = $_POST['calculation_data'];
    
    $wpdb->insert(
        $table_name,
        array(
            'product_id' => intval($data['product_id']),
            'base_cost' => floatval($data['base_cost']),
            'material_cost' => floatval($data['material_cost']),
            'labor_cost' => floatval($data['labor_cost']),
            'additional_cost' => floatval($data['additional_cost']),
            'total_cost' => floatval($data['total_cost']),
            'quantity' => intval($data['quantity'])
        ),
        array('%d', '%f', '%f', '%f', '%f', '%f', '%d')
    );
    
    wp_send_json_success(array('message' => '计算记录已保存'));
}

// 获取成本报告
public function get_cost_report() {
    // 验证用户权限
    if (!current_user_can('manage_options')) {
        wp_die('权限不足');
    }
    
    global $wpdb;
    $table_name = $wpdb->prefix . 'cost_calculator_logs';
    
    $start_date = isset($_POST['start_date']) ? sanitize_text_field($_POST['start_date']) : date('Y-m-01');
    $end_date = isset($_POST['end_date']) ? sanitize_text_field($_POST['end_date']) : date('Y-m-d');
    
    $results = $wpdb->get_results($wpdb->prepare(
        "SELECT 
            p.post_title as product_name,
            COUNT(l.id) as calculation_count,
            AVG(l.total_cost) as avg_cost,
            SUM(l.total_cost) as total_cost_sum,
            AVG(l.quantity) as avg_quantity
        FROM {$table_name} l
        LEFT JOIN {$wpdb->posts} p ON l.product_id = p.ID
        WHERE DATE(l.calculated_at) BETWEEN %s AND %s
        GROUP BY l.product_id
        ORDER BY calculation_count DESC",
        $start_date, $end_date
    ));
    
    wp_send_json_success($results);
}

}
?>

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## 主控制器类

<?php
// includes/class-cost-calculator.php

class Cost_Calculator_Main {

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private $admin_settings;
private $product_metabox;
private $frontend_display;
private $ajax_handler;

public function __construct() {
    // 初始化各个组件
    $this->admin_settings = new Cost_Calculator_Admin_Settings();
    $this->product_metabox = new Cost_Calculator_Product_Metabox();
    $this->frontend_display = new Cost_Calculator_Frontend_Display();
    $this->ajax_handler = new Cost_Calculator_Ajax_Handler();
}

public function run() {
    // 注册短代码
    add_shortcode('cost_calculator_report', array($this, 'render_report_shortcode'));
    
    // 添加管理菜单
    add_action('admin_menu', array($this, 'add_admin_menu'));
}

// 添加管理菜单
public function add_admin_menu() {
    add_menu_page(
        __('成本核算', 'cost-calculator'),
        __('成本核算', 'cost-calculator'),
        'manage_options',
        'cost-calculator',
        array($this, 'render_admin_page'),
        'dashicons-calculator',
        30
    );
    
    add_submenu_page(
        'cost-calculator',
        __('成本报告', 'cost-calculator'),
        __('成本报告', 'cost-calculator'),
        'manage_options',
        'cost-calculator-reports',
        array($this, 'render_reports_page')
    );
}

// 渲染管理页面
public function render_admin_page() {
    ?>
    <div class="wrap">
        <h1><?php _e('成本核算设置', 'cost-calculator'); ?></h1>
        
        <form method="post" action="options.php">
            <?php
            settings_fields('cost_calculator_settings');
            do_settings_sections('cost_calculator_settings');
            submit_button();
            ?>
        </form>
        
        <div class="cost-calculator-stats">
            <h2><?php _e('统计概览', 'cost-calculator'); ?></h2>
            <?php
            global $wpdb;
            $table_name = $wpdb->prefix . 'cost_calculator_logs';
            
            $total_calculations = $wpdb->get_var("SELECT COUNT(*) FROM {$table_name}");
            $today_calculations = $wpdb->get_var($wpdb->prepare(
                "SELECT COUNT(*) FROM {$table_name} WHERE DATE(calculated_at) = %s",
                date('Y-m-d')
            ));
            
            echo '<p>' . sprintf(__('总计算次数: %d', 'cost-calculator'), $total_calculations) . '</p>';
            echo '<p>' . sprintf(__('今日计算次数: %d', 'cost-calculator'), $today_calculations) . '</p>';
            ?>
        </div>
    </div>
    <?php
}

// 渲染报告页面
public function render_reports_page() {
    ?>
    <div class="wrap">
        <h1><?php _e('成本分析报告', 'cost-calculator'); ?></h1>
        
        <div class="report-filters">
            <form method="post" id="cost-report-form">
                <label for="start_date"><?php _e('开始日期:', 'cost-calculator'); ?></label>
                <input type="date" id="start_date" name="start_date" 
                       value="<?php echo date('Y-m-01'); ?>">
                
                <label for="end_date"><?php _e('结束日期:', 'cost-calculator'); ?></label>
                <input type="date" id="end_date" name="end_date" 
                       value="<?php echo date('Y-m-d'); ?>">
                
                <button type="button" id="generate-report" class="button button-primary">
                    <?php _e('生成报告', 'cost-calculator'); ?>
                </button>
            </form>
        </div>
        
        <div id="report-results" style="margin-top: 20px;">
            <table class="wp-list-table widefat fixed striped">
                <thead>
                    <tr>
                        <th><?php _e('产品名称', 'cost-calculator'); ?></th>
                        <th><?php _e('计算次数', 'cost-calculator'); ?></th>
                        <th><?php _e('平均成本', 'cost-calculator'); ?></th>
                        <th><?php _e('成本总额', 'cost-calculator'); ?></th>
                        <th><?php _e('平均数量', 'cost-calculator'); ?></th>
                    </tr>
                </thead>
                <tbody id="report-data">
                    <!-- 报告数据将通过AJAX加载 -->
                </tbody>
            </table>
        </div>
        
        <script>
        jQuery(document).ready(function($) {
            $('#generate-report').click(function() {
                var formData = $('#cost-report-form').serialize();
                
                $.ajax({
                    url: '<?php echo admin_url('admin-ajax.php'); ?>',
                    type: 'POST',
                    data: {
                        action: 'get_cost_report',
                        ...formData
                    },
                    success: function(response) {
                        if (response.success) {
                            var html = '';
                            $.each(response.data, function(index, item) {
                                html += '<tr>' +
                                    '<td>' + (item.product_name || '未命名产品') + '</td>' +
                                    '<td>' + item.calculation_count + '</td>' +
                                    '<td>' + parseFloat(item.avg_cost).toFixed(2) + ' 元</td>' +
                                    '<td>' + parseFloat(item.total_cost_sum).toFixed(2) + ' 元</td>' +
                                    '<td>' + parseFloat(item.avg_quantity).toFixed(1) + '</td>' +
                                    '</tr>';
                            });
                            $('#report-data').html(html);
                        }
                    }
                });
            });
            
            // 页面加载时自动生成报告
            $('#generate-report').click();
        });
        </script>
    </div>
    <?php
}

// 短代码：显示成本报告
public function render_report_shortcode($atts) {
    if (!current_user_can('manage_options')) {
        return '<p>' . __('您没有查看报告的权限。', 'cost-calculator') . '</p>';
    }
    
    ob_start();
    $this->render_reports_page();
    return ob_get_clean();
}

}
?>

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## 管理设置类

<?php
// includes/admin/class-admin-settings.php

class Cost_Calculator_Admin_Settings {

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public function __construct() {
    add_action('admin_init', array($this, 'register_settings'));
}

// 注册设置
public function register_settings() {
    register_setting(
        'cost_calculator_settings',
        'cost_calculator_profit_margin',
        array(
            'type' => 'number',
            'sanitize_callback' => array($this, 'sanitize_profit_margin'),
            'default' => '30'
        )
    );
    
    add_settings_section(
        'cost_calculator_main_section',
        __('主要设置', 'cost-calculator'),
        array($this, 'render_section_callback'),
        'cost_calculator_settings'
    );
    
    add_settings_field(
        'profit_margin_field',
        __('默认利润率 (%)', 'cost-calculator'),
        array($this, 'render_profit_margin_field'),
        'cost_calculator_settings',
        'cost_calculator_main_section'
    );
}

// 渲染设置部分
public function render_section_callback() {
    echo '<p>' . __('配置成本核算插件的基本设置。', 'cost-calculator') . '</p>';
}

// 渲染利润率字段
public function render_profit_margin_field() {
    $value = get_option('cost_calculator_profit_margin', '30');
    echo '<input type="number" name="cost_calculator_profit_margin" 
                 value="' . esc_attr($value) . '" min="0" max="100" step="0.1">';
    echo '<p class="description">' . __('用于计算建议售价的利润率百分比。', 'cost-calculator') . '</p>';
}

// 验证利润率输入
public function sanitize_profit_margin($input) {
    $value = floatval($input);
    if ($value < 0 || $value > 100) {
        add_settings_error(
            'cost_calculator_profit_margin',
            'invalid_profit_margin',
            __('利润率必须在0-100%之间。', 'cost-calculator')
        );
        return get_option('cost_calculator_profit_margin');
    }
    return $value;
}

}
?>

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## 前端样式文件

/ assets/css/style.css /

.cost-calculator-container {

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background-color: #f9f9f9;
border-left: 4px solid #0073aa;

}

.cost-calculator-container h3 {

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margin-top: 0;
color: #23282d;

}

.cost-calculator-container .form-row {

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margin-bottom: 15px;

}

.cost-calculator-container label {

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display: block;
margin-bottom: 5px;
font-weight: 600;

}

.cost-calculator-container input[type="number"],
.cost-calculator-container select {

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padding: 8px;
border: 1px solid #ddd;
border-radius: 3px;

}

.cost-calculator-container .material-option {

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margin-bottom: 5px;
display: flex;
gap: 4%;

}

.cost-result {

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border-top: 2px solid #0073aa;

}

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margin-top: 10px;
padding-top: 10px;
border-top: 1px dashed #ccc;

}

/ 响应式设计 /
@media (max-width: 768px) {

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.cost-calculator-container .form-row {
    display: flex;
    flex-direction: column;
}

.cost-calculator-container input,
.cost-calculator-container select {
    width: 100% !important;
}

}

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## 部署和使用说明

### 安装步骤

1. **创建插件目录**：将上述所有文件按照结构保存到 `wp-content/plugins/cost-calculator/` 目录

2. **激活插件**：在WordPress后台的插件页面找到"小批量定制成本核算器"并激活

3. **配置设置**：进入"成本核算"设置页面，配置默认利润率

### 使用方法

1. **产品设置**：
   - 编辑产品时，在侧边栏找到"成本核算设置"元数据框
   - 输入基础成本、单位人工成本
   - 添加材料选项及其成本

2. **前端使用**：
   - 客户在产品页面可以看到成本计算器
   - 选择数量、材料等选项，实时查看成本估算
   - 系统会自动保存计算记录

3. **查看报告**：
   - 管理员可以在"成本核算 → 成本报告"页面查看分析报告
   - 使用短代码 `[cost_calculator_report]` 在任何页面显示报告

### 扩展建议

1. **批量导入**：添加CSV导入功能，批量设置产品成本
2. **供应商管理**：集成供应商价格，自动更新材料成本
3. **高级报告**：添加图表可视化，导出PDF报告功能
4. **邮件通知**：当成本超过阈值时发送通知

## 总结

本教程详细介绍了如何开发一个完整的WordPress成本核算插件。通过这个插件，小批量定制产品商家可以：

1. 精确核算每个定制订单的成本
2. 实时调整定价策略
3. 分析不同材料和数量的成本影响
4. 优化生产流程和采购决策

插件采用模块化设计，便于后续扩展和维护。您可以根据具体业务需求添加更多功能，如集成第三方API获取实时材料价格、添加折扣计算、生成报价单等。