php - 在foreach cicle中查找数组的最后一个值

Question

我将数据存储在一个数组（$rows）中。为了读取数组并生成一个动态表，我使用 foreach 函数。

<table>

    foreach ($rows as $row) {
        echo "<tr>";
        echo "<td>" . $row['field1'] . "</td>";
        echo "<td>" . $row['field2'] . "</td>";
        echo "<td>" . $row['filed3'] . "</td>";
        echo "</tr>"; 
    }

</table>

我的目标是找到数组的最后一个值（末尾），以便为显示的最后一行更改 TR 元素的类。我怎么能这样做？谢谢

Answer 1

试试这个：

foreach ($rows as $key => $row) {
    $end = end($rows) === $row ? 'class="last"' : '';
    echo "<tr $end>";
    echo "<td>" . $row['field1'] . "</td>";
    echo "<td>" . $row['field2'] . "</td>";
    echo "<td>" . $row['filed3'] . "</td>";
    echo "</tr>"; 
}

此方法也适用于多维数组。

http://codepad.org/HQG9ytBX

编辑. 正如评论中所指出的，如果数组中的某些值重复（最后一个），这种方法可能会触发错误的最终结果。正确的防弹版本应该是：

foreach ($rows as $key => $row) {
    $end = end($rows) === $row && $key === key($rows) ? 'class="last"' : '';

    // ...

Answer 2

foreach ($rows as $row) {
$is_last_row = ++$i == count($rows);
        echo "<tr>";
        echo "<td>" . $row['field1'] . "</td>";
        echo "<td>" . $row['field2'] . "</td>";
        echo "<td>" . $row['filed3'] . "</td>";
        echo "</tr>"; 
    }

这里 $i 应该是一个未使用的变量。

Answer 3

试试这个

$numItems = count($rows);
$i = 0;
foreach($rows as $row) {

$trClass = 'firstclass';
if(++$i === $numItems) 
{
$trClass = 'lastclass';
}


echo "<tr class='$trclass'>";
    echo "<td>" . $row['field1'] . "</td>";
    echo "<td>" . $row['field2'] . "</td>";
    echo "<td>" . $row['filed3'] . "</td>";
    echo "</tr>"; 
}  

Answer 4

// first, let's find out the last key
end($rows);
$last = key($rows);

// then just loop over
foreach ($rows as $key => $row) {
        if ($key == $last) {
            // last leaf of the summer...
        }
        echo "<tr>";
        echo "<td>" . $row['field1'] . "</td>";
        echo "<td>" . $row['field2'] . "</td>";
        echo "<td>" . $row['filed3'] . "</td>";
        echo "</tr>"; 
}