在foreach中查找數組的最後一個值cicle

Question

我將數據存儲在數組中（$ rows）。 爲了讀取數組並使用動態表格，我使用了foreach函數。

<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> 

我的目標是找到數組的最後一個值（結束），以便爲顯示的最後一行更改TR元素的類。 我怎麼能這樣做？ 感謝

Answer 1

試試這個：

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>"; 
} 

此方法適用於多維數組也是如此。

http://codepad.org/HQG9ytBX

編輯。正如評論中所指出的，如果數組中的某些值重複（最後一個），則此方法可能會觸發錯誤的最終結果。正確的防彈版本應該是：

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>"; 
    } 

這裏$我應該是一個未使用的變量。

Answer 3

嘗試這個

$numItems = count($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>"; 
}