我有这段代码，应该会更改输出的日期，但我没有得到任何更改。有人能看到出了什么问题吗？
<?php
$tempStartDate = "2011-07-04 15:00:00";
$TempDaysFromEvent = "-14";
$newtempStartDate = explode(" ", $tempStartDate);
echo "New Temp Start Date: ".$newtempStartDate[0];
echo "<br>";
list($year, $month, $day) = explode("-", $newtempStartDate[0]);
echo $year." ". $month. " ". $day;
echo "<br>";
$tempStartDate = $tempEndDate = date("Y-m-d", mktime(0,0,0,$month,($day+$tempDaysFromEvent),$year));
echo "TempStart Date:".$tempStartDate."<br>";
?>
这给了我这个输出：
New Temp Start Date: 2011-07-04
2011 07 04
TempStart Date:2011-07-04
但我希望它能给我：
New Temp Start Date: 2011-07-04
2011 07 04
TempStart Date:2011-06-20
当您定义$TempDaysFromEvent时，您有一个资本，因此将其更改为该
$tempStartDate = $tempEndDate = date("Y-m-d", mktime(0,0,0,$month,($day+$TempDaysFromEvent),$year));您应该收到以下通知：
Notice: Undefined variable: tempDaysFromEvent in C:'tmp'test.php on line 12
您的变量实际上是$TempDaysFromEvent。PHP中的变量区分大小写。
中有一个打字错误
$tempDaysFromEvent而不是$TempDaysFromEvent
一个不那么复杂的解决方案：
$tempStartDate = "2011-07-04 15:00:00";
print date('Y-m-d H:i:s', strtotime('-14 days', strtotime($tempStartDate)));