如何使用PHP进行时间区间查询

// 使用时间戳
$timestamp = time();
echo $timestamp; // 输出当前时间的时间戳

// 使用 DateTime 类
$datetime = new DateTime();
echo $datetime->fORMat('Y-m-d H:i:s'); // 输出当前时间

SELECT * FROM `orders` WHERE `order_date` BETWEEN '2021-01-01' AND '2021-03-31';

// 获取开始时间和结束时间
$start_date = '2021-01-01';
$end_date = '2021-03-31';

// 构建查询语句
$sql = "SELECT * FROM `orders` WHERE `order_date` BETWEEN '".$start_date."' AND '".$end_date."';";

// 获取开始时间和结束时间
$start_date = '2021-01-01';
$end_date = '2021-03-31';

try {
    // 连接数据库
    $pdo = new PDO("Mysql:host=localhost;dbname=mydatabase;charset=utf8", "username", "passWord");

    // 构建查询语句
    $sql = "SELECT * FROM `orders` WHERE `order_date` BETWEEN :start_date AND :end_date;";

    // 准备查询
    $stmt = $pdo->prepare($sql);

    // 绑定参数
    $stmt->bindParam(':start_date', $start_date);
    $stmt->bindParam(':end_date', $end_date);

    // 执行查询
    $stmt->execute();

    // 处理结果
    $result = $stmt->fetchAll();
    var_dump($result);
} catch (PDOException $e) {
    echo "数据库连接失败：" . $e->getMessage();
}