自定义时间函数
<?php /** * @desc获取指定的日期 * @ string $vdate 2000-01-31 * @parma int $vnum +~-1 * @param string $vtype day/month/year * @retuen string date */ function datecount($vdate,$vnum,$vtype){ $day = date('j',strtotime($vdate)); $month = date('n',strtotime($vdate)); $year = date('Y',strtotime($vdate)); switch($vtype){ case 'day': if($vnum >= 0){ $day = $day + abs($vnum); }else{ $day = $day - abs($vnum); } break; case 'month': if($vnum >= 0){ $month = $month + abs($vnum); }else{ $month = $month - abs($vnum); } break; case 'year': if($vnum >= 0){ $year = $year + abs($vnum); }else{ $year = $year - abs($vnum); } break; default : break; } $time = mktime(0,0,0,$month,$day,$year); return date('Y-m-d',$time); } echo datecount('2000-01-31',-1,'month');