Check if the date is a legal date

Check if the date is a legal date

<?php
function check_date($date) { //Check whether the date is a legal date
$dateArr = explode("-", $date);
 if (is_numeric($dateArr[0]) && is_numeric ($dateArr[1]) && is_numeric($dateArr[2])) { //Open source OSPhP.COM.CN
 return checkdate($dateArr[1],$dateArr[2],$dateArr[0]);
 }
 return false;
}
function check_time($time) { //Check whether the time is legal time
//OSPHP.COM.Cn open source
$timeArr = explode(":", $time);
 if (is_numeric( $timeArr[0]) && is_numeric($timeArr[1]) && is_numeric($timeArr[2])) {
//Open source code OSPHP.COM.Cn
 if (($timeArr[0] >= 0 && $timeArr[0] <= 23) && ($timeArr[1] >= 0 && $timeArr[1] <= 59) && ($timeArr[2] >= 0 && $timeArr[2] &lt ;= 59))
//PHP open source code
 return true;
 else
 return false;
 }
 return false;
}
function DateDiff($date1, $date2, $unit = "") { //Time comparison Function, returns the difference in seconds, minutes, hours or days between two dates
switch ($unit) {
 case 's':
$dividend = 1;
 break;
 case 'i':
$dividend = 60;
//oSPHP.COM.CN
 break;
 case 'h':
$dividend = 3600;
 break;
 case 'd':
$dividend = 86400;
 break;
 default:
$dividend = 86400;
 }
$time1 = strtotime($date1);
$time2 = strtotime($date2);
 if ($time1 && $time2) //OSPHP.com.CN
 return (float)($time1 - $ time2) / $dividend;
 return false;
}
?>