PHP：多维数组，多维键？

Question

$products = array(
  'paper' => "Paper Section" => array
  (
    'copier' => "Copier and Multipurpose",
    'inkjet' => "Inkjet Printer",
  ),
  'pens' => "Pen Section" => array
  (
    'ball' => "Ballpoint Pens",
    'hilite' => "Highlighters"
  ),
  'misc' => "Miscellaneous Section" => array
  (
    'tape' => "Sticky Tape",
    'glue' => "Adhesive"
  )
);

echo "<pre>";
foreach ($products as $section => $items)
  foreach ($items as $key => $value)
    echo "$section:\t$key\t($value)<br />";
echo "</pre>";

显然，我在这里尝试做的是将索引分配给 $section 集，并且尝试执行此操作时出现错误。有没有其他方法可以做到这一点，或者在 PHP 中这是不可能的？

Answer 1

$products = array(
  'paper' => array(
    'title' => "Paper Section",
    'copier' => "Copier and Multipurpose",
    'inkjet' => "Inkjet Printer"
  )
);   

例如上面的一些东西。另一种选择是添加另一个维度：

$products = array(
  'paper' => array(
    'meta' => array(
        'title' => "Paper Section"
    ),
    'data' => array(
        'copier' => "Copier and Multipurpose",
        'inkjet' => "Inkjet Printer"
    )
  )
);

Answer 2

您想要做的是数组中的另一个维度。这就是您问题的解决方案。

Answer 3

<?php
$products = array(
    'paper' => array(
    // --------^^^^^
        'Paper Section' => array(
            'copier' => 'Copier and Multipurpose',
            'inkjet' => 'Inkjet Printer',
        ),
    )
);
var_dump($products);

PS：当你更好地格式化（和缩进）你的代码时，它会更容易。

Answer 4

不太明白你想要实现的目标，我仍然会尝试一下。下面，我重组了数据：

$products = array(
  'paper' => array(
    'Paper Section',
    array (
      'copier' => "Copier and Multipurpose",
      'inkjet' => "Inkjet Printer"
    )
  ),
  'pens' => array(
    'Pen Section',
    array (
      'ball' => "Ballpoint Pens",
      'hilite' => "Highlighters"
    )
  ),
  'misc' => array(
    'Miscellaneous Section',
    array (
      'tape' => "Sticky Tape",
      'glue' => "Adhesive"
    )
  )
);

foreach ($products as $sectionKey => $line) {
  foreach ($line[1] as $key => $value) {
    echo $sectionKey . ":\t" . $line[0] . ":\t$key\t($value)\n";
  }
}

您可以在 Ideone 上观看演示。

Answer 5

    $products = array(
      'paper' => array(
        "Paper Section" => array
          (
            'copier' => "Copier and Multipurpose",
            'inkjet' => "Inkjet Printer",
          )
       ),
      'pens' => array(
        "Pen Section" => array
        (
            'ball' => "Ballpoint Pens",
            'hilite' => "Highlighters"
          ),
      ),
      'misc' => array(
        "Miscellaneous Section" => array
        (
            'tape' => "Sticky Tape",
            'glue' => "Adhesive"
          )
      )
);

正如其他人提到的，您需要将其包装在另一个关联数组中。

但是，我感觉您正在尝试将最深的关联数组同时分配给两个键。如果是这种情况，您无法在 PHP 的数组声明中执行此操作，您必须手动执行一些操作，例如：

$products = array();
$products['Misc'] = $products['Miscellaneous Section'] = array(
      'tape' => "Sticky Tape",
      'glue' => "Adhesive"
);

var_dump($products);

Answer 6

好吧，对我来说你想要做什么还很不明显，但是你的语法是错误的：数组的构建方式类似于 'key'=>'value'，因为它是一个键/值对您有：

'paper' => "Paper Section" => array()

键->值->值。那是行不通的。

还：

echo "
";

可能是：

echo "\n";