php 将分钟前/小时前转为日期

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$startTime = date("Y-m-d H:i:s"); if(strpos($date,'分钟前') !== false){     $dtime=strstr($date,'分钟前',true);     $mstr = $dtime>1?' minutes':' minute';     $tstr= '-'.$dtime.$mstr;     $date = date('Y-m-d H:i:s',strtotime($tstr,strtotime($startTime)));    }else if(strpos($date,'小时前') !== false){     $dtime=strstr($date,'小时前',true);     $hstr = $dtime>1?' hours':' hour';     $tstr= '-'.$dtime.$hstr;     $date = date('Y-m-d H:i:s',strtotime($tstr,strtotime($startTime)));    }