/**
* PHP北京时间转太平洋时间的函数
*/
public function PRCToPacific($time=''){
if(empty($time)){
date_default_timezone_set('Asia/Shanghai');
$time = time();
}
date_default_timezone_set('Pacific/Apia');
$date = date('Y-m-d H:i:s',$time);
$time = strtotime($date);
return $time;
}