/****模拟sqlserver中的dateadd函数******* $part 类型：string 取值范围：year,month,day,hour,min,sec 表示：要增加的日期的哪个部分 $n 类型：数值 表示：要增加多少，根据$part决定增加哪个部分 可为负数 $datetime类型：timestamp 表示：增加的基数 返回 类型：timestamp **************结束**************/ function dateadd($part,$n,$datetime){ $year=date("Y",$datetime); $month=date("m",$datetime); $day=date("d",$datetime); $hour=date("H",$datetime); $min=date("i",$datetime); $sec=date("s",$datetime); $part=strtolower($part); $ret=0; switch ($part) { case "year": $year =$n; break; case "month": $month =$n; break; case "day": $day =$n; break; case "hour": $hour =$n; break; case "min": $min =$n; break; case "sec": $sec =$n; break; default: return $ret; break; } $ret=mktime($hour,$min,$sec,$month,$day,$year); return $ret; }
/****模拟sqlserver中的datediff函数******* $part 类型：string 取值范围：year,month,day,hour,min,sec 表示：要增加的日期的哪个部分 $date1,$date2 类型：timestamp 表示：要比较的两个日期 返回 类型：数值 **************结束*(*************/ function datediff($part,$date1,$date2){ //$diff=$date2-$date1; $year1=date("Y",$date1); $year2=date("Y",$date2); $month2=date("m",$date2); $month1=date("m",$date1); $day2=date("d",$date2); $day1=date("d",$date1); $hour2=date("d",$date2); $hour1=date("d",$date1); $min2=date("i",$date2); $min1=date("i",$date1); $sec2=date("s",$date2); $sec1=date("s",$date1);
$part=strtolower($part); $ret=0; switch ($part) { case "year": $ret=$year2-$year1; break; case "month": $ret=($year2-$year1)*12 $month2-$month1; break; case "day": $ret=(mktime(0,0,0,$month2,$day2,$year2)-mktime(0,0,0,$month1,$day1,$year1))/(3600*24); break; case "hour": $ret=(mktime($hour2,0,0,$month2,$day2,$year2)-mktime($hour1,0,0,$month1,$day1,$year1))/3600; break; case "min": $ret=(mktime($hour2,$min2,0,$month2,$day2,$year2)-mktime($hour1,$min1,0,$month1,$day1,$year1))/60; break; case "sec": $ret=$date2-$date1; break; default: return $ret; break; } return $ret; }
} sonymusic