PHP แจกโค้ดตัวอย่างการอ่าน/เขียน/ลบ node บน XML

<?php
$text_xml_file = 'test-domxml.xml';
$act = (isset($_REQUEST['act']) ? trim($_REQUEST['act']) : '');


// first detect that xml file exists, if not just create new xml file.
detectFileAndCreate();

if ($act == 'write') {
    writeXmlData();
} elseif ($act == 'delete') {
    deleteXmlDataOrFile();
}


/**
 * Delete XML data or file.
 * 
 * @return boolean Return true on success deletion, false for otherwise.
 */
function deleteXmlDataOrFile()
{
    global $text_xml_file;

    $ids = (isset($_REQUEST['id']) ? $_REQUEST['id'] : []);
    $delete = (isset($_REQUEST['delete']) ? trim($_REQUEST['delete']) : '');

    if ($delete === 'all') {
        unset($delete, $ids);

        if (is_file($text_xml_file) && is_writable($text_xml_file)) {
            unlink($text_xml_file);
            detectFileAndCreate();
            return true;
        }
        return false;
    } elseif ($delete === 'selected') {
        unset($delete);

        if (!empty($ids)) {
            $dom = new \DOMDocument('1.0', 'UTF-8');
            $dom->validateOnParse = true;
            $dom->preserveWhiteSpace = false;
            $dom->formatOutput = true;
            $dom->load($text_xml_file);

            if (is_array($ids)) {
                $delete_count = 0;
                foreach ($ids as $id) {
                    $repo_list = $dom->getElementsByTagName('list');
                    foreach ($repo_list as $repository) {
                        $items = $repository->getElementsByTagName('item');
                        if ($items != null) {
                            foreach ($items as $item) {
                                if ($item->getAttribute('id') == $id) {
                                    $item->parentNode->removeChild($item);
                                    $delete_count++;
                                }
                            }// endforeach; $items
                            unset($item);
                        }
                        unset($items);
                    }// endforeach; $repo_list
                }// endforeach; $ids
                unset($id);

                if ($delete_count > 0) {
                    $dom->save($text_xml_file, LIBXML_NOEMPTYTAG);
                    unset($delete_count, $dom, $ids);
                    return true;
                }
                unset($delete_count);
            }
        }// endif !empty($ids)
    }

    unset($delete, $dom, $ids);
    return false;
}// deleteXmlDataOrFile


/**
 * Detect XML file and create if not exists.
 */
function detectFileAndCreate()
{
    global $text_xml_file;

    if (!file_exists($text_xml_file)) {
        $dom = new \DOMDocument('1.0', 'UTF-8');
        $dom->preserveWhiteSpace = false;
        $dom->formatOutput = true;

        $root = $dom->createElement('root');
        $root = $dom->appendChild($root);

        // plugins xml list
        $plugins = $dom->createElement('plugins');
        $plugins = $root->appendChild($plugins);

        $title = $dom->createElement('title');
        $title = $plugins->appendChild($title);

        $title_text = $dom->createTextNode('Plugins list');
        $title_text = $title->appendChild($title_text);

        $list = $dom->createElement('list');
        $list = $plugins->appendChild($list);

        // themes xml list
        $themes = $dom->createElement('themes');
        $themes = $root->appendChild($themes);

        $title = $dom->createElement('title');
        $title = $themes->appendChild($title);

        $title_text = $dom->createTextNode('Themes list');
        $title_text = $title->appendChild($title_text);

        $list = $dom->createElement('list');
        $list = $themes->appendChild($list);

        $dom->save($text_xml_file, LIBXML_NOEMPTYTAG);
        unset($dom, $list, $plugins, $root, $themes, $title, $title_text);
    }

    if (file_exists($text_xml_file) && !is_file($text_xml_file)) {
        throw new \Exception('The file "' . $text_xml_file . '" is not a file, please delete it manually at ' . realpath($text_xml_file) . '.');
    }
}// detectFileAndCreate


/**
 * Display XML data.
 * 
 * @param string $section The section value is plugins or themes.
 */
function displayXmlData($section)
{
    global $text_xml_file;

    if ($section != 'plugins' && $section != 'themes') {
        $section = 'plugins';
    }

    $dom = new \DOMDocument('1.0', 'UTF-8');
    $dom->preserveWhiteSpace = false;
    $dom->formatOutput = true;
    $dom->load($text_xml_file);

    $repo_list = $dom
            ->getElementsByTagName($section)->item(0)
            ->getElementsByTagName('list');

    if (!empty($repo_list)) {
        foreach ($repo_list as $repository) {
            $items = $repository->getElementsByTagName('item');
            if ($items != null) {
                foreach ($items as $item) {
                    $name = $item->getElementsByTagName('name')->item(0);
                    $version = $item->getElementsByTagName('version')->item(0);
                    echo '<label>'."\n";
                    echo '    <input type="checkbox" name="id[]" value="' . $item->getAttribute('id') . '"> ';
                    echo 'ID ' . $item->getAttribute('id') . ': ' . $name->nodeValue . ' ' . $version->nodeValue . "\n";
                    echo '</label><br>'."\n";
                    unset($name, $version);
                }// endforeach;
                unset($item);
            }
            unset($items);
        }// endforeach;
        unset($repository);
    }

    unset($dom, $repo_list);
}// displayXmlData


/**
 * Write XML data to exists XML file.
 */
function writeXmlData()
{
    global $text_xml_file;

    $section = (isset($_REQUEST['section']) ? trim($_REQUEST['section']) : 'plugins');
    $id = (isset($_REQUEST['id']) ? trim($_REQUEST['id']) : '');
    $name = (isset($_REQUEST['name']) ? trim($_REQUEST['name']) : '');
    $version = (isset($_REQUEST['version']) ? trim($_REQUEST['version']) : '');

    if ($section != null && $name != null && $version != null && $id != null && is_numeric($id)) {
        $dom = new \DOMDocument('1.0', 'UTF-8');
        $dom->preserveWhiteSpace = false;
        $dom->formatOutput = true;
        $dom->load($text_xml_file);

        $repo_list = $dom
            ->getElementsByTagName($section)->item(0)
            ->getElementsByTagName('list')->item(0);

        $repository = $dom->createElement('item');

        $repository_attribute = $dom->createAttribute('id');
        $repository_attribute->value = $id;
        $repository->appendChild($repository_attribute);

        $name_element = $dom->createElement('name');
        $name_element = $repository->appendChild($name_element);

        $name_text = $dom->createTextNode($name);
        $name_text = $name_element->appendChild($name_text);

        $version_element = $dom->createElement('version');
        $version_element = $repository->appendChild($version_element);

        $version_text = $dom->createTextNode($version);
        $version_text = $version_element->appendChild($version_text);

        $repo_list->appendChild($repository);
        $dom->save($text_xml_file, LIBXML_NOEMPTYTAG);
    }

    unset($dom, $name, $name_element, $name_text, $repo_list, $repository, $section, $version, $version_element, $version_text);
}// writeXmlData


?>
<!DOCTYPE html>
<html>
    <head>
        <meta charset="utf-8">
        <title>Test DOM XML</title>
        <style type="text/css">
            h1, h2, h3, h4, h5, h6, p {
                margin: 0 0 10px 0;
                padding: 0;
            }
            hr {
                border: none;
                border-top: 1px solid #ccc;
            }
            pre {
                background-color: #333;
                color: #ddd;
                margin: 0 0 10px;
                overflow: hidden;
                overflow-wrap: break-word;
                overflow-y: auto;
                padding: 10px;
                white-space: pre-wrap;
                word-break: break-all;
                word-wrap: break-word;
            }
            .form-result-placeholder {
                display: none;
                margin: 0 0 20px;
            }
            .container::after {
                clear: both;
                content: '';
                display: table;
            }
            .container {
                margin: 0 auto;
                width: 1000px;
            }
            .xml-read {
                float: left;
                margin: 0 10px 0 0;
                width: 490px;
            }
            .xml-write-delete {
                float: left;
                margin: 0 0 0 10px;
                width: 490px;
            }
        </style>
    </head>
    <body>
        <div class="form-result-placeholder">
            
        </div><!--.form-result-placeholder-->
        <div class="container">
            <h1>Test read/write XML using DOM</h1>
            <div class="xml-read">
                <h2>XML content</h2>
                <pre><?php echo htmlspecialchars(file_get_contents($text_xml_file), ENT_QUOTES); ?></pre>
            </div><!--.xml-read-->
            <div class="xml-write-delete">
                <h3>Write</h3>
                <form method="post">
                    <input type="hidden" name="act" value="write">
                    Section:
                    <select name="section">
                        <option value="plugins">Plugins</option>
                        <option value="themes">Themes</option>
                    </select><br>
                    ID:
                    <input type="number" name="id" autocomplete="off"><br>
                    Name:
                    <input type="text" name="name" autocomplete="off"><br>
                    Version:
                    <input type="text" name="version" autocomplete="off"><br>
                    <button type="submit">Submit</button>
                </form>
                <hr>
                <h3>Delete</h3>
                <form method="post">
                    <input type="hidden" name="act" value="delete">
                    <h4>Plugins</h4>
                    <?php displayXmlData('plugins'); ?> 
                    <h4>Themes</h4>
                    <?php displayXmlData('themes'); ?> 
                    <button type="submit" name="delete" value="selected">Delete selected</button>
                    <button type="submit" name="delete" value="all">Delete all (delete XML file)</button>
                </form>
            </div><!--.xml-write-delete-->
        </div><!--.container-->
    </body>
</html>