A PHP function that adds or subtracts a specified amount of time from a timestamp and returns the result in a specified format.

Here is a PHP function that adds or subtracts a specified amount of time from a timestamp and then outputs the resulting time in a specified format:

<?php
/**
 * 将指定时间与时间戳相加减后，输出指定格式时间
 *
 * @param string $time 日期时间字符串，格式为 'Y-m-d H:i:s'
 * @param int $seconds 要添加或减去的秒数，正数为加，负数为减
 * @param string $format 输出的日期时间格式，默认为 'Y-m-d H:i:s'
 * @return string 格式化后的日期时间字符串
 */
function add_seconds_to_time($time, $seconds, $format = 'Y-m-d H:i:s') {
    // 将日期时间字符串转换为时间戳
    $timestamp = strtotime($time);

    // 计算加减后的时间戳
    $new_timestamp = $timestamp + $seconds;

    // 将时间戳格式化为指定格式的日期时间字符串
    $new_time = date($format, $new_timestamp);

    // 返回格式化后的日期时间字符串
    return $new_time;
}

// 示例用法
$time = '2023-04-25 13:03:02';
$seconds = 3600; // 假设要将时间加上1小时
$new_time = add_seconds_to_time($time, $seconds);
echo $new_time; // 输出 '2023-04-25 14:03:02'
?>

You can save the above code as a PHP file and call this function wherever needed to add or subtract a specified amount of time from or to a timestamp. When calling this function, you must pass three parameters:

• $timeDate and time string in the format 'Y-m-d H:i:s'
• $secondsThe number of seconds to add or subtract; a positive value adds seconds, while a negative value subtracts seconds.
• $formatThe output date and time format defaults to 'Y-m-d H:i:s'; you can specify a custom format as needed.

The function returns a formatted date and time string.