用php和mysql做减法
我正在开发一个 joomla 扩展，在 default.php 文件中我有这样的代码：
foreach($this->subv as $subv) {
$giorni = ((int)$subv->data_fine - (int)$subv->data_inizio);
$ore = ($giorni * 24) % 24;
echo $giorni.' : '.$ore;
}
$this->subv 是一个包含 mysql 查询结果的对象。我的问题是 echo 打印 $subv->data_fine 值，而不是减法的结果。 $subv->data_fine 和 $subv->data_inizio 包含 time() 函数的结果。 我该如何解决这个问题？ 谢谢！
I am developing a joomla extension and in default.php file i have this code:
foreach($this->subv as $subv) {
$giorni = ((int)$subv->data_fine - (int)$subv->data_inizio);
$ore = ($giorni * 24) % 24;
echo $giorni.' : '.$ore;
}
$this->subv is an object that contains the result of a mysql query. My problem is that echo prints $subv->data_fine value, and not the result of the substraction. $subv->data_fine and $subv->data_inizio contain the result of time() function.
How can i resolve it this problem?
Thanks!
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如果我正确理解你的问题，
$giorni等于$subv->data_fine，这只是意味着(int)$subv->data_inizio计算为零。你检查过了吗？If I understand you problem correctly,
$giorniis equal to$subv->data_fine, which would simply mean that(int)$subv->data_inizioevaluates to zero. Have you checked that?您可以使用 mysql 获取 2 个日期之间的差异（DATEDIFF 函数）：
You can use mysql to get the difference between 2 dates (DATEDIFF function):
http://dev.mysql.com/doc/refman/5.5/en/date-and-time-functions.html#function_datediff