Simulate two functions of SQLSERVER: dateadd(), datediff()_PHP tutorial

//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"));

/****Simulate the dateadd function in sqlserver************
$part Type: string
Value range: year, month, day, hour, min, sec
means: the date to be added Which part of
$n type: numeric value
means: how much to increase, which part to increase is decided according to $part
can be a negative number
$datetime type: timestamp
means: the base of the increase
Return type: timestamp
**************End*******************/
function dateadd($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
means: the date to be added Which part of
$date1,$date2 Type: timestamp
Represents: Two dates to be compared
Return type: Numeric value
**************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;
}
?>

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