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<?php /** * This file is part of CodeIgniter 4 framework. * * (c) CodeIgniter Foundation <admin@codeigniter.com> * * For the full copyright and license information, please view * the LICENSE file that was distributed with this source code. */ namespace CodeIgniter\Format; use CodeIgniter\Format\Exceptions\FormatException; use Config\Format; use SimpleXMLElement; /** * XML data formatter */ class XMLFormatter implements FormatterInterface { /** * Takes the given data and formats it. * * @param mixed $data * * @return bool|string (XML string | false) */ public function format($data) { $config = new Format(); // SimpleXML is installed but default // but best to check, and then provide a fallback. if (! extension_loaded('simplexml')) { // never thrown in travis-ci // @codeCoverageIgnoreStart throw FormatException::forMissingExtension(); // @codeCoverageIgnoreEnd } $options = $config->formatterOptions['application/xml'] ?? 0; $output = new SimpleXMLElement('<?xml version="1.0"?><response></response>', $options); $this->arrayToXML((array) $data, $output); return $output->asXML(); } /** * A recursive method to convert an array into a valid XML string. * * Written by CodexWorld. Received permission by email on Nov 24, 2016 to use this code. * * @see http://www.codexworld.com/convert-array-to-xml-in-php/ * * @param SimpleXMLElement $output */ protected function arrayToXML(array $data, &$output) { foreach ($data as $key => $value) { $key = $this->normalizeXMLTag($key); if (is_array($value)) { $subnode = $output->addChild("{$key}"); $this->arrayToXML($value, $subnode); } else { $output->addChild("{$key}", htmlspecialchars("{$value}")); } } } /** * Normalizes tags into the allowed by W3C. * Regex adopted from this StackOverflow answer. * * @param int|string $key * * @return string * * @see https://stackoverflow.com/questions/60001029/invalid-characters-in-xml-tag-name */ protected function normalizeXMLTag($key) { $startChar = 'A-Z_a-z' . '\\x{C0}-\\x{D6}\\x{D8}-\\x{F6}\\x{F8}-\\x{2FF}\\x{370}-\\x{37D}' . '\\x{37F}-\\x{1FFF}\\x{200C}-\\x{200D}\\x{2070}-\\x{218F}' . '\\x{2C00}-\\x{2FEF}\\x{3001}-\\x{D7FF}\\x{F900}-\\x{FDCF}' . '\\x{FDF0}-\\x{FFFD}\\x{10000}-\\x{EFFFF}'; $validName = $startChar . '\\.\\d\\x{B7}\\x{300}-\\x{36F}\\x{203F}-\\x{2040}'; $key = trim($key); $key = preg_replace("/[^{$validName}-]+/u", '', $key); $key = preg_replace("/^[^{$startChar}]+/u", 'item$0', $key); return preg_replace('/^(xml).*/iu', 'item$0', $key); // XML is a reserved starting word } }