php gets the number of days between dates

Question: How to calculate the number of days between two dates in PHP? Answer: Create two DateTime objects; use the diff() method to calculate the days interval; output the result.

PHP Gets the number of days between dates

In PHP, we can use the datediff() function to Calculate the number of days between two dates.

<?php

// 创建两个日期对象
$date1 = new DateTime('2023-01-01');
$date2 = new DateTime('2023-01-10');

// 计算日期间隔天数
$interval = $date1->diff($date2);

// 输出天数间隔
echo $interval->days;
?>

Practical Case

Suppose we have a database that stores the user's order date. We need to calculate the number of days between the user's first order and the last order.

<?php

// 连接数据库并查询订单数据
$mysqli = new mysqli("localhost", "root", "password", "database");
$sql = "SELECT MIN(order_date) AS first_order, MAX(order_date) AS last_order FROM orders WHERE user_id = 1";
$result = $mysqli->query($sql);

// 获取订单日期范围
$row = $result->fetch_assoc();
$first_order = $row['first_order'];
$last_order = $row['last_order'];

// 创建日期对象并计算天数间隔
$date1 = new DateTime($first_order);
$date2 = new DateTime($last_order);
$interval = $date1->diff($date2);

// 输出天数间隔
echo $interval->days;
?>

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