Php 如何从下到下按列显示表格？

我有一个数组：

如何从表中的数组自上而下显示此数据

这应该是这样的：

category1  | category 2 | category3
product33  | product1   | product65
product41  | product45  | product23
           |            | product423

我试过：

<table>
  <tr>
     <?php foreach ($array as $category): ?>
         <td><?php echo $category ?></td>
     <?php endforeach ?>
  </tr>
//????
</table>

//????

您可以尝试以下方法：

<?php
 foreach ($array as $category)
 {
   echo "<td>" . key($array) . "</td>";

   foreach ($category as $item)
   {
     echo "<td>" . $item . "</td>";
   }
   next($array);
 }
?>

---

看看这个简单的例子：

<?php
$data = [
    'category1' => [
        'product33',
        'product41'
    ],
    'category2' => [
        'product1',
        'product45'
    ],
    'category3' => [
        'product65',
        'product23',
        'product423'
    ],
];

$maxSize = 0;
foreach ($data as $category) {
    $maxSize = max($maxSize, count($category));
}

for ($i=-1; $i<$maxSize; $i++) {
    foreach ($data as $key=>$category) {
        if (-1 === $i) {
            echo $key . "\t";
        } else {
            echo isset($category[$i]) ? $category[$i] . "\t" : "\t\t";
        }
    }
    echo "\n";
}

---

注意：这是为了在CLI上用于演示目的。额外的html标记只会使代码演示膨胀

我认为你的问题与

首先计算

$max\u产品

。然后打印标题（类别1、类别2等）。然后在嵌套循环中将行中的元素打印到

$max_products

（您需要检查该类别是否有索引为

$i

ofc的元素）

$max_products=0；
foreach（$category=>$products的数组）{
$current=计数（$products）；
如果（$current>$max_产品）{
$max_products=$current；
}
}?>

从上到下是什么意思？是否要在数据中显示多行？

<?php
$data = [
    'category1' => [
        'product33',
        'product41'
    ],
    'category2' => [
        'product1',
        'product45'
    ],
    'category3' => [
        'product65',
        'product23',
        'product423'
    ],
];

$maxSize = 0;
foreach ($data as $category) {
    $maxSize = max($maxSize, count($category));
}

for ($i=-1; $i<$maxSize; $i++) {
    foreach ($data as $key=>$category) {
        if (-1 === $i) {
            echo $key . "\t";
        } else {
            echo isset($category[$i]) ? $category[$i] . "\t" : "\t\t";
        }
    }
    echo "\n";
}

category1       category2       category3
product33       product1        product65
product41       product45       product23
                                product423

$max_products = 0;

foreach($array as $category => $products){

    $current = count($products);

    if($current > $max_products){
        $max_products = $current;
    }
}?>

<table>
    <thead>
        <tr>
            <?php
                foreach( $array as $category => $products ){
                    echo "<th>$category</th>";
                }
            ?>
        </tr>
    </thead>
    <tbody>

        <?php for( $i = 0; $i < $max_products; $i++ ){ ?>
        <tr>

            <?php
                foreach( $array as $category => $products ){

                    if( $products[$i] ){
                        echo "<td>$products[$i]</td>";
                    } else {
                        echo "<td>&nbsp;</td>";
                    }

                }
            ?>

        </tr>
        <?php } ?>

    </tbody>
</table>