「PHPの学習」phpで日付の合法性を確認する

phpコード:
<?php
function check_date($date) { //日付の合法性をチェック
$dateArr = explode(“-“, $date);
if (is_numeric($dateArr[0]) && is_numeric($dateArr[1]) && is_numeric($dateArr[2])) {
return checkdate($dateArr[1],$dateArr[2],$dateArr[0]);
}
return false;
}
function check_time($time) { //時間の合法性をチェック

$timeArr = explode(“:", $time);
if (is_numeric($timeArr[0]) && is_numeric($timeArr[1]) && is_numeric($timeArr[2])) {

if (($timeArr[0] >= 0 && $timeArr[0] <= 23) && ($timeArr[1] >= 0 && $timeArr[1] <= 59) && ($timeArr[2] >= 0 && $timeArr[2] <= 59))

return true;
else
return false;
}
return false;
}
function DateDiff($date1, $date2, $unit = “") { //時間比較関数
switch ($unit) {
case 's’:
$dividend = 1;
break;
case 'i’:
$dividend = 60;
break;
case 'h’:
$dividend = 3600;
break;
case 'd’:
$dividend = 86400;
break;
default:
$dividend = 86400;
}
$time1 = strtotime($date1);
$time2 = strtotime($date2);
if ($time1 && $time2) /
return (float)($time1 – $time2) / $dividend;
return false;
}
?>

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Posted by arkgame