Question

我有一系列状态，我想要做的是按首字母对它们进行分类，然后显示这些组。我几乎正常工作，最后一个问题是：

what I have so far

我希望所有状态都在逗号分隔的单个框中，而不是每个状态都在它自己的灰色框中。这是我的代码：

<?
    $lastChar = '';
    sort($state_list, SORT_STRING | SORT_FLAG_CASE);

    foreach ($state_list as $state) {
        $char = $state[0];
        echo "<div class=\"stateTable\">";
        if ($char !== $lastChar) {
            echo "<div class=\"stateTopRow\">" . strtoupper($char) . "</div>";
                echo "<div class=\"clear\"></div>";
        $lastChar = $char;
        }
            echo "<div class=\"stateBody\">" . $state . "</div>";
                echo "<div class=\"clear\"></div>";
        echo "</div>";
    }
?>

问题在于它为每个单独的状态循环整个stateBody div。我试过在if语句中以某种方式包括stateBody，但这完全打破了样式（并且理所当然）。

有没有办法在if语句中包含stateBody，然后添加另一个foreach来循环通过相应的状态？谢谢！

Answer 1

我会建议采用略有不同的方法。由于您最终希望将它们全部分组，因此最好通过相应地组织阵列来开始。循环遍历它，并创建一个新数组，其子数组由第一个字母索引。在迭代原始数组时，在适当字符的索引处追加到新数组。然后，为您的输出循环更容易。

通常最好将数据格式化为最终需要的结构，以便稍后简化输出逻辑。

// Start by sorting as you already did
sort($state_list, SORT_STRING | SORT_FLAG_CASE);

// Create a new array
$output_array = array();

// Loop over the one you have...
foreach ($state_list as $state) {
  $first = strtoupper($state[0]);
  // Create the sub-array if it doesn't exist
  if (!isset($output_array[$first])) {
    $ouput_array[$first] = array();
  }

  // Then append the state onto it
  $output_array[$first][] = $state;
}

结果数组如下所示：

Array
(
    [A] => Array
        (
            [0] => Alabama
            [1] => Arkansas
            [2] => Alaska
        )

    [C] => Array
        (
            [0] => Connecticut
        )

)

现在你需要一个简单的循环和一个implode()来产生你的输出：

// For clarity, I omitted your surrounding <div> markup
// this is just the first letter and the state lists...
foreach($output_array as $state_index => $states) {
  // The index is the first letter...
  echo "<div class='stateTopRow'>$state_index</div>";

  // And the sub-array can be joined with implode()
  echo "<div class='stateBody'>" . implode(', ', $states) . "</div>";
}

Answer 2

<?
    $lastChar = '';
    sort($state_list, SORT_STRING | SORT_FLAG_CASE);
    $cnt = 0;

    echo "<div class=\"stateTable\">";
    foreach ($state_list as $state) {
        $char = $state[0];

        if ($char !== $lastChar) {
            if (($char !== 'a') && ($char !== 'A')) {
                echo "</div><div class=\"clear\"></div>";   // close off last state list 
            }
            echo "<div class=\"stateTopRow\">" . strtoupper($char) . "</div>";
                echo "<div class=\"clear\"></div>";
            $lastChar = $char;
            $cnt = 0;
        }
        if ($cnt == 0) {
            echo "<div class=\"stateBody\">" . $state;
        } else {
            echo ", " . $state;
        }
            $cnt++;
    }
    echo "</div>";
?>

Answer 3

$lastChar = '';
sort($state_list, SORT_STRING | SORT_FLAG_CASE);

echo "<div class='stateTable'>";
foreach ($state_list as $state)
{
    $char = $state[0];
    if ($char != $lastChar)
    {
        if ($lastChar != '')
            echo "</div><div class='clear' />"; // close previous state list
        $lastChar = $char;
        echo "<div class='stateTopRow'>" . strtoupper($char) . "</div>";
        echo "<div class='stateBody'>$state"; // open new state list
    }
    else // next state name
    {
        echo ", $state";
    }
}
echo "</div><div class='clear' />"; // close last list
echo "</div>";                      // close whole table

正如另一位评论者所说，混合输出和数据组织很少是一个好的理念看看你把问题分开后会变得多么简单：

// sort all states alphabetically
sort($state_list, SORT_STRING | SORT_FLAG_CASE);

// split names according to their initial
foreach ($state_list as $state)
    $alpha_table[$state[0]][] = $state;

// output each letter group
foreach ($alpha_table as $letter => $list)
{
    echo "<div class='stateTopRow'>".strtoupper($letter) ."</div>". // header
         "<div class='stateBody'>"  .implode (",", $list)."</div>". // list
         "<div class='clear' />";                                   // separator
}

Answer 4

如果要将所有内容保存在一次扫描中（性能方面），我建议如下：

<?
        $lastChar = '';
        sort($state_list, SORT_STRING | SORT_FLAG_CASE);

        foreach ($state_list as $state) {
            $char = $state[0];
             $states_arr = array();
            echo "<div class=\"stateTable\">";

                 if ($char !== $lastChar) {
                   echo "<div class=\"stateTopRow\">" . strtoupper($char) . "</div>";
                   echo "<div class=\"clear\"></div>";

                   //if not the first letter
                   if ($lastChar) {
                     echo "</div>";//end the stateDiv div
                     echo implode($states_arr,', ');//print the states with commas
                   }

                   //open the stateBody div
                   echo "<div class=\"stateBody\">";

                    $lastChar = $char;
                }

                //add state to the array but don't print yet
                $states_arr[] = $state;

                echo "<div class=\"clear\"></div>";
            echo "</div>";
        }
    ?>

如果性能不是一个因素，您可能希望实际运行2次扫描 - 第一次扫描组织数据，第二次扫描显示数据。

但是，上述方法应该按照您的要求运作。

希望这有帮助！

Answer 5

<?php
$state_list= array("alabama", "alaska", "arkansas");
$lastChar = '';
sort($state_list, SORT_STRING | SORT_FLAG_CASE);

foreach ($state_list as $state) {
    $char = $state[0];
    echo "<div>";
    echo "<div class=\"stateTable\">";
    if ($char !== $lastChar) {
        echo "<div class=\"stateTopRow\">" . strtoupper($char) ."</div>";
            echo "<div class=\"clear\"></div>";
    $lastChar = $char;
    }
}
$states= implode(",", $state_list);
echo $states;
?>

带有分组项的PHP Foreach循环

5 个答案: