解决PHP文件上传中“无此文件或目录”错误：日期格式化路径陷阱

<form action="actions/insert.php" method="POST" enctype="multipart/form-data">
    <!-- 其他表单字段 -->
    <div class="form-group">
        <label for="productImage" class="form-label">上传产品图片</label>
        <input type="file" name="cover_image" class="form-control" id="productImage">
    </div>
    <button class="btn btn-primary" type="submit" name="add_product">发布</button>
</form>

$cover_image = $_FILES['cover_image']['name'];
$image_extension = pathinfo($cover_image, PATHINFO_EXTENSION);

// 原始的命名方式，包含斜杠
$image_rand = rand(time(), 100000000);
$image_rename = 'prod_'.date('Y/m/d')."_".$image_rand; // 问题所在！

$image_new_name = $image_rename.".".$image_extension; // 完整的新文件名
$new_location = "../images/products/".$image_new_name; // 产品封面图片上传路径
$image_tmp = $_FILES['cover_image']['tmp_name'];

// 尝试移动文件
$move_uploaded_file_result = move_uploaded_file($image_tmp, $new_location);

// 原始的命名方式 (错误示例)
// $image_rename = 'prod_'.date('Y/m/d')."_".$image_rand; 

// 修正后的命名方式：将斜杠替换为下划线
$image_rename = 'prod_'.date('Y_m_d')."_".$image_rand; // 正确！
// 或者使用连字符
// $image_rename = 'prod_'.date('Y-m-d')."_".$image_rand; // 同样正确！

$image_new_name = $image_rename.".".$image_extension; 
$new_location = "../images/products/".$image_new_name; 
$image_tmp = $_FILES['cover_image']['tmp_name'];

$move_uploaded_file_result = move_uploaded_file($image_tmp, $new_location);

// ... 后续的数据库插入操作 ...

<?php
session_start(); // 确保会话已启动
// 假设 $DB 是你的数据库连接对象或辅助类实例
// 假设 $DB->mysqli 是 mysqli 连接对象

if (isset($_POST['add_product'])) {
    // 获取用户ID (示例，根据实际情况调整)
    $user_id = 1; // 假设已从会话或数据库获取

    // 生成产品ID和清理输入数据
    $product_id         = rand(time(), 100000000);
    $product_name       = mysqli_real_escape_string($DB->mysqli, $_POST['product_name']);
    $short_description  = mysqli_real_escape_string($DB->mysqli, $_POST['short_description']);
    $full_description   = mysqli_real_escape_string($DB->mysqli, $_POST['full_description']);
    $product_price      = mysqli_real_escape_string($DB->mysqli, $_POST['product_price']);
    $discount_price     = mysqli_real_escape_string($DB->mysqli, $_POST['discount_price']);
    $brand              = mysqli_real_escape_string($DB->mysqli, $_POST['brand']);
    $categories         = mysqli_real_escape_string($DB->mysqli, $_POST['categories']);
    $tags               = mysqli_real_escape_string($DB->mysqli, $_POST['tags']);
    $stock_quantity     = mysqli_real_escape_string($DB->mysqli, $_POST['stock_quantity']);
    $on_sale            = 1;
    $date               = date("Y-m-d H:i:s"); // 使用24小时制和完整时间

    // --- 文件上传处理 ---
    if (isset($_FILES['cover_image']) && $_FILES['cover_image']['error'] === UPLOAD_ERR_OK) {
        $cover_image_original_name = $_FILES['cover_image']['name'];
        $image_tmp_name = $_FILES['cover_image']['tmp_name'];
        $image_extension = pathinfo($cover_image_original_name, PATHINFO_EXTENSION);

        // 生成唯一且安全的文件名
        $image_rand = rand(100000000, 999999999); // 随机数范围
        // 修正后的日期格式，避免斜杠
        $image_date_part = date('Y_m_d'); 
        $image_new_base_name = 'prod_' . $image_date_part . '_' . $image_rand;
        $image_new_name = $image_new_base_name . '.' . $image_extension;

        // 定义目标上传目录
        // 确保路径是相对于当前脚本的正确路径，或者使用绝对路径
        $upload_dir = '../images/products/'; 
        $new_location = $upload_dir . $image_new_name;

        // 检查目标目录是否存在，如果不存在则创建
        if (!is_dir($upload_dir)) {
            // 0755 是目录权限，true 表示递归创建
            if (!mkdir($upload_dir, 0755, true)) {
                $_SESSION['error'] = "无法创建上传目录。";
                header('location:../new-products.php');
                exit();
            }
        }

        // 移动上传的文件
        if (move_uploaded_file($image_tmp_name, $new_location)) {
            // 文件上传成功，将文件信息存入数据库
            $DB->insert('products', [
                'product_id'          => $product_id,
                'user_id'             => $user_id,
                'product_name'        => $product_name,
                'product_short_descrip' => $short_description,
                'product_description' => $full_description,
                'normal_price'        => $product_price,
                'discount_price'      => $discount_price,
                'on_sale'             => $on_sale,
                'stock_quantity'      => $stock_quantity,
                'brand'               => $brand,
                'categories'          => $categories,
                'tags'                => $tags,
                'product_image'       => $image_new_name, // 存储新生成的文件名
                'date_added'          => $date
            ]);

            if ($DB->isSuccess()) { // 假设 $DB 有一个方法检查操作是否成功
                $_SESSION['success'] = "产品添加成功。";
                header('location:../all-products.php');
            } else {
                // 数据库插入失败，可能需要删除已上传的文件
                unlink($new_location); 
                $_SESSION['error'] = "操作失败：数据库插入错误。";
                header('location:../all-products.php');
            }
        } else {
            $_SESSION['error'] = "图片上传失败。请重试。";
            header('location:../new-products.php');
        }
    } else {
        // 没有文件上传，或者上传过程中出现错误
        $_SESSION['error'] = "未选择图片或图片上传出错。错误代码: " . $_FILES['cover_image']['error'];
        header('location:../new-products.php');
    }
} else {
    // 非法访问，直接跳转或显示错误
    header('location:../new-products.php');
}
?>