How to implement time zone conversion in php

<?php
/**
 * @param string $dateTime 时间，如：2020-04-22 10:10:10
 * @param string $fromZone 时间属于哪个时区
 * @param string $toZone   时间转换为哪个时区的时间
 * @param string $format   时间格式，如：Y-m-d H:i:s
 * 时区选择参考：https://www.php.net/manual/zh/timezones.php 常见的如：UTC,Asia/Shanghai
 * 时间格式参考：https://www.php.net/manual/zh/datetime.formats.php
 *
 * @return string
 */
function dateTimeChangeByZone($dateTime, $fromZone, $toZone, $format = &#39;Y-m-d H:i:s&#39;)
{
    $dateTimeZoneFrom = new DateTimeZone($fromZone);
    $dateTimeZoneTo   = new DateTimeZone($toZone);
    $dateTimeObj      = DateTime::createFromFormat($format, $dateTime, $dateTimeZoneFrom);
    $dateTimeObj->setTimezone($dateTimeZoneTo);
 
    return $dateTimeObj->format($format);
}
 
echo dateTimeChangeByZone(&#39;2020-04-22 10:10:10&#39;, &#39;UTC&#39;, &#39;Asia/Shanghai&#39;, &#39;Y-m-d H:i:s&#39;);

2020-04-22 18:10:10