Question

我正在创建一个小预订系统。行设置为当前周列到特定时间。

我要做的是将日期名称更改为特定颜色。过去的蓝色，日期当前为绿色。不知怎的，if语句没有做任何事情。任何人都可以解释或指出我正确的方向吗？

$today = time();

$lastWeek = [];
$lastWeek[0] = date('D',strtotime('last monday'));
$lastWeek[1] = date('D',strtotime('last monday +1day'));
$lastWeek[2] = date('D',strtotime('last monday +2day'));
$lastWeek[3] = date('D',strtotime('last monday +3day'));
$lastWeek[4] = date('D',strtotime('last monday +4day'));

$timeSlot = [];
$timeSlot [0] = date('H:i', strtotime('9:00'))      ."-9:30";
$timeSlot [1] = date('H:i', strtotime('9:30'))      ."-10:00";
$timeSlot [2] = date('H:i', strtotime('10:00'))     ."-10:30";
$timeSlot [3] = date('H:i', strtotime('10:30'))     ."-11:00";
$timeSlot [4] = date('H:i', strtotime('11:00'))     ."-11:30";
$timeSlot [5] = date('H:i', strtotime('11:30'))     ."-12:00";

echo "<html><head><title>Doctor Booking timetable</title></head>";
echo "<body><table id=myTable border=2 align=center >";

echo "<tr><td>Week Commencing</td>";

foreach ($timeSlot as $time)
{
    echo"<td>";
    echo $time;
    echo"</td>";
}
echo "</tr>";

foreach ($lastWeek as $day)
{
    echo "<tr><td>";
    echo $day;
    echo "</td></tr>";
}

if ($lastWeek < $today){
    echo "<font color='blue'></font>";
}else {
    echo "<font color='green'></font>";
}

Answer 1

您需要将if语句放在foreach内（如您的帖子标题所示），并在您的颜色标记中包含$day。仅供参考font代码已弃用很长时间，您应该使用span代替。

在您的问题中，您要将$lastWeek与$today进行比较 - $lastWeek是一个数组，您正在循环播放。根据您的foreach，当前迭代将包含在$day变量中，因此您应将与$today进行比较：

foreach ($lastWeek as $day)
{
    echo "<tr><td>";
    $color = ($day < $today) ? 'blue' : 'green';
    echo '<span style="color: ' . $color . '">' . $day . '</span>';
    echo "</td></tr>";
}

PS：我在这里使用ternary operator作为你的if语句。这和写作一样：

if($day < $today)
    $color = 'blue';
else
    $color = 'green';

......但更短

PPS。我假设您的日期格式正确，可以使用GT / LT运算符进行比较。如果不是，则需要使用date function之类的格式对其进行格式化。

Answer 2

除非非常需要，否则我不会使用已弃用的标签。请参阅http://www.w3schools.com/tags/tag_font.asp

中的相关内容

使用您的代码样式：

$today = time();

$lastWeek = array();
$lastWeek[0] = date('D',strtotime('last monday'));
$lastWeek[1] = date('D',strtotime('last monday +1day'));
$lastWeek[2] = date('D',strtotime('last monday +2day'));
$lastWeek[3] = date('D',strtotime('last monday +3day'));
$lastWeek[4] = date('D',strtotime('last monday +4day'));

$timeSlot = array();
$timeSlot [0] = date('H:i', strtotime('9:00'))      ."-9:30";
$timeSlot [1] = date('H:i', strtotime('9:30'))      ."-10:00";
$timeSlot [2] = date('H:i', strtotime('10:00'))     ."-10:30";
$timeSlot [3] = date('H:i', strtotime('10:30'))     ."-11:00";
$timeSlot [4] = date('H:i', strtotime('11:00'))     ."-11:30";
$timeSlot [5] = date('H:i', strtotime('11:30'))     ."-12:00";

echo "<html><head><title>Doctor Booking timetable</title></head>";
echo "<body><table id=myTable border=2 align=center >";

echo "<tr><td>Week Commencing</td>";

foreach ($timeSlot as $time)
{
    echo"<td>";
    echo $time;
    echo"</td>";
}
echo "</tr>";

foreach ($lastWeek as $day)
{
    echo "<tr><td>";
    if ($lastWeek < $today){
        echo "<font color='blue'>$day</font>";
    }else {
        echo "<font color='green'>$day</font>";
    }
    echo "</td></tr>";
}

如果语句在foreach循环中

2 个答案: