检查时间变量，确保其少于30天，但不少于当前时间 - check time variable to ensure its less than 30 days but not less than the current time

check time variable to ensure its less than 30 days but not less than the current time

我正在尝试检查我的字符串$when，以确保它不是基于当前时间（）的未来30天以上，但也不小于当前时间（。由于某种原因，strtotime导致了某种问题。关于如何使这个脚本发挥作用，有什么建议吗？

<?php
$when = '2011/07/11 11:22:52';
if ($when > strtotime('+30 days', time()));
{
echo "too far into the future";
header('Refresh: 10; URL=page.php');
die();
}
if ($when < time());
{
echo "less than current time";
header('Refresh: 10; URL=page.php');
die();
}
echo "pass";
header('Refresh: 10; URL=page.php');
die();
?>

您的问题是将日期字符串与Unix时间戳进行比较。在进行比较之前，您需要将$when转换为Unix时间戳：

$when = strtotime('2011-07-11 11:22:52');

我发现使用DateTime()使它变得简单易读（还可以处理夏令时等问题）：

$when   = new DateTime('2011-07-11 11:22:52');
$now    = new DateTime();
$future = new DateTime('+30 days');
if ($when > $future )
{
echo "too far into the future";
header('Refresh: 10; URL=page.php');
die();
}
if ($when < $now)
{
echo "less than current time";
header('Refresh: 10; URL=page.php');
die();
}
echo "pass";
header('Refresh: 10; URL=page.php');
die();