php - 根据平面数据在PHP中构建分层html标签

如何在PHP中用数据构建一组分层的标记？
例如，嵌套列表：

<div>
    <ul>
        <li>foo
        </li>
        <li>bar
            <ul>
                <li>sub-bar
                </li>
            </ul>
        </li>
    </ul>
</div>

这将基于如下平面数据构建：

nested_array = array();
nested_array[0] = array('name' => 'foo', 'depth' => 0)
nested_array[1] = array('name' => 'bar', 'depth' => 0)
nested_array[2] = array('name' => 'sub-bar', 'depth' => 1)

如果它的格式也能像示例一样好，那就太好了。

最佳答案

编辑：添加的格式
正如评论中已经提到的，您的数据结构有些奇怪。与使用文本操作（如OIS）不同，我更喜欢DOM：

<?php

$nested_array = array();
$nested_array[] = array('name' => 'foo', 'depth' => 0);
$nested_array[] = array('name' => 'bar', 'depth' => 0);
$nested_array[] = array('name' => 'sub-bar', 'depth' => 1);
$nested_array[] = array('name' => 'sub-sub-bar', 'depth' => 2);
$nested_array[] = array('name' => 'sub-bar2', 'depth' => 1);
$nested_array[] = array('name' => 'sub-sub-bar3', 'depth' => 3);
$nested_array[] = array('name' => 'sub-sub3', 'depth' => 2);
$nested_array[] = array('name' => 'baz', 'depth' => 0);

$doc = new DOMDocument('1.0', 'iso-8859-1');
$doc->formatOutput = true;
$rootNode = $doc->createElement('div');
$doc->appendChild($rootNode);

$rootList = $doc->createElement('ul');
$rootNode->appendChild($rootList);

$listStack = array($rootList); // Stack of created XML list elements
$depth = 0; // Current depth

foreach ($nested_array as $nael) {
    while ($depth < $nael['depth']) {
        // New list element
        if ($listStack[$depth]->lastChild == null) {
            // More than one level at once
            $li = $doc->createElement('li');
            $listStack[$depth]->appendChild($li);
        }
        $listEl = $doc->createElement('ul');
        $listStack[$depth]->lastChild->appendChild($listEl);
        array_push($listStack, $listEl);

        $depth++;
    }

    while ($depth > $nael['depth']) {
        array_pop($listStack);
        $depth--;
    }

    // Add the element itself
    $li = $doc->createElement('li');
    $li->appendChild($doc->createTextNode($nael['name']));
    $listStack[$depth]->appendChild($li);
}

echo $doc->saveXML();

你的格式惯例有点奇怪。将最后一行替换为以下内容：

printEl($rootNode);

function printEl(DOMElement $el, $depth = 0) {
    $leftFiller = str_repeat("\t", $depth);
    $name = preg_replace('/[^a-zA-Z]/', '', $el->tagName);

    if ($el->childNodes->length == 0) {
        // Empty node
        echo $leftFiller . '<' . $name . "/>\n";
    } else {
        echo $leftFiller . '<' . $name . ">";
        $printedNL = false;

        for ($i = 0;$i < $el->childNodes->length;$i++) {
            $c = $el->childNodes->item($i);

            if ($c instanceof DOMText) {
                echo htmlspecialchars($c->wholeText);
            } elseif ($c instanceof DOMElement) {
                if (!$printedNL) {
                    $printedNL = true;
                    echo "\n";
                }
                printEl($c, $depth+1);
            }
        }

        if (!$printedNL) {
            $printedNL = true;
            echo "\n";
        }

        echo $leftFiller . '</' . $name . ">\n";
    }

}