php - undefined variable : $sameday at somthing.php

Question

我将这段代码写在something.php上以进行特色 Activity

$day_start = date("j", mktime(0,0,0,$event_start_month, $event_start_day, $event_start_year));

$day_end = date("j", mktime(0,0,0, $event_end_month, $event_end_day, $event_end_year));



        if (($day_start == $day_end)) {
            $same_day = true;
        }
        <?php if ($same_day == false) { ?>
<span class="value value-date"> - <?php echo $day_end; ?></span>

当我回应这个

<?php if ($same_day == false) { ?>
<span class="value value-date"> - <?php echo $day_end; ?></span>

发生错误

Error Processing Feed: Undefined variable: same_day at something.php

Answer 1

您应该始终为$same_day分配一些内容，以避免出现此警告。像这样:

if (($day_start == $day_end)) {
        $same_day = true;
    } else{
        $same_day =false; // <-- This is the new part.
    }
...
if ($same_day == false) {

否则仅是通知。但是要清洁才能正确处理

或者更简单地不引入新变量。在第二个if中仅使用($day_start == $day_end)，并完全省略第一个。