Time processing class in PHP

php Several time processing classes in ：DateTime,DateTimeZone,DateInterval,DatePeriod.

DateTime ： Time class

DateTimeZone： In time zone

DateInterval： A time interval , It is the unit of addition and subtraction of the time object .

DatePeriod： Represents a collection over a period of time . combination DateInterval Time traversal processing in the set .

The following are specific examples of these classes ：

<?php

function showTimeObj($msg,$timeObj)
{
    // Use a predefined format to convert time strings 
    if ($msg!=NULL)
    {
        echo $msg.":";
        echo "<br>".$timeObj->format(DATE_W3C)."<br>";
    }
    else
    {
        echo $timeObj->format(DATE_ATOM)."<br>";
    }
}

try
{
   // Set time zone 
    $timezones = new DateTimeZone('Asia/Shanghai');
    // Get the current time 
    $timeObj=new DateTime("now",$timezones);
}
catch (Exception $e)
{
    echo $e->getMessage();
}

// Output +08:00 It represents the East eighth district 、 If the time zone is set to 'Asia/Tokyo', Then for +09:00
showTimeObj('current time',$timeObj);

echo "<br>"."<br>";
echo "use DateInterval object to add date time".":"."<br>";
// Plus one day (P=period, necessary )
$timeObj->add(new DateInterval('P1D'));
showTimeObj('current time + 1 day',$timeObj);

// Plus one hour (T=time, Optional )
$timeObj->add(new DateInterval('P0DT1H'));
showTimeObj('current time + 1 day & 1hour',$timeObj);

echo "<br>"."<br>";
echo "use DatePeriod to process time range like a iterator".":"."<br>";
//DatePeriod:  The date in the iteration processing interval 
$interval= new DateInterval('P0DT2H');

$start = new DateTime('2008-08-08',$timezones);
$end = new DateTime('2008-08-09',$timezones);
$timeRange = new DatePeriod($start,$interval,$end);

foreach ($timeRange as $hour)
{
    showTimeObj(NULL,$hour);
}

?>

Here is the result of the above code displayed in the browser ：

PS： Two pieces of information are recommended , One is translated by Chinese 《 About php A practical guide to confusing knowledge points 》、 The other is a Laravel Several articles sorted out by the community 《 Best practices 》