使用PHP开发商场物流接口：代码实现商品出库流程控制！

<?php

// 连接数据库
$mysqli = new mysqli("localhost", "username", "password", "database");
if ($mysqli->connect_error) {
    die("数据库连接失败: " . $mysqli->connect_error);
}

// 商品出库流程控制类
class Logistics {
    
    private $mysqli;
    
    // 构造函数
    public function __construct($mysqli) {
        $this->mysqli = $mysqli;
    }
    
    // 商品出库
    public function goodsOutbound($orderID) {
        $sql = "SELECT * FROM orders WHERE orderID = '$orderID'";
        $result = $this->mysqli->query($sql);
        
        if ($result->num_rows > 0) {
            $row = $result->fetch_assoc();
            $status = $row["status"];
            
            if ($status == "未出库") {
                $goodsID = $row["goodsID"];
                $quantity = $row["quantity"];
                
                $sql = "SELECT * FROM goods WHERE goodsID = '$goodsID'";
                $result = $this->mysqli->query($sql);
                $row = $result->fetch_assoc();
                $stock = $row["stock"];
                
                if ($stock >= $quantity) {
                    $stock -= $quantity;
                    
                    $sql = "UPDATE goods SET stock = '$stock' WHERE goodsID = '$goodsID'";
                    $this->mysqli->query($sql);
                    
                    $sql = "UPDATE orders SET status = '已出库' WHERE orderID = '$orderID'";
                    $this->mysqli->query($sql);
                    
                    echo "商品出库成功！";
                } else {
                    echo "商品库存不足，无法出库！";
                }
            } else {
                echo "订单已经出库！";
            }
        } else {
            echo "订单不存在！";
        }
    }
}

// 实例化物流类
$logistics = new Logistics($mysqli);

// 商品出库
$logistics->goodsOutbound("1001");

// 关闭数据库连接
$mysqli->close();

?>