PHP simulates two date processing functions of SQL Server_PHP tutorial

//It is very inconvenient to process dates in PHP. For example, find the month difference between two dates? What to do? //File name: date.inc.php3 //Before using these two functions, you must first convert the date or date time into the timestamp type. //For example: //$today=mktime(0,0,0,date("m"),date("d"),date("Y")); /****Simulating the dateadd function in sqlserver************  $part type: string  Value range: year, month, day, hour, min, sec  Representation: which part of the date to be added $n type: numerical representation : How much to increase, decide which part to increase based on $part. It can be a negative number. $datetime type: timestamp . Represents: the base of the increase. Return type: timestamp **************End****** ********/ 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; } /****Simulate the datediff function in sqlserver************  $part type: string  Value range: year, month, day, hour, min, sec  Represents: which part of the date to be added $date1, $date2 type : timestamp Represents: Two dates to be compared Return type: Numeric **************End* (*************/ function datediff ($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; } }

http://www.bkjia.com/PHPjc/531932.htmlwww.bkjia.comtruehttp: //www.bkjia.com/PHPjc/531932.htmlTechArticle//It is very inconvenient to process dates in PHP, such as finding the month difference between two dates? What to do? //File name: date.inc.php3 //Before using these two functions, you must first change the date or...