PHP implementation code for converting DateTime objects into friendly time display_PHP tutorial

/**
* Friendly date and time
*
* @param DateTime $datetime Date and time
* @param int $size Accurate to digits
* @throws InvalidArgumentException
* @return string
*/
function friendly_date($datetime, $size=1)
{
if (is_int($datetime)) {
$datetime = new DateTime($datetime);
}
if (!($datetime instanceof DateTime)) {
throw new InvalidArgumentException('invalid "DateTime" object');
}
$now = new DateTime();
$interval = $now->diff($datetime);
$intervalData = array(
$interval->y, $interval->m, $interval->d,
$interval->h, $interval->i, $interval->s,
);
$intervalFormat = array('年', '个月', '天', '小时', '分种', '秒');
foreach($intervalData as $index=>$value) {
if ($value) {
$intervalData[$index] = $value . $intervalFormat[$index];
} else {
unset($intervalData[$index]);
unset($intervalFormat[$index]);
}
}
return implode('', array_slice($intervalData, 0, $size));
}