PHP从字符串中移除XML标签的实现方案

Got it, let's break down how to strip those XML tags from your PHP string that’s made up of multiple separate XML snippets. Here are a few reliable approaches, ranging from quick fixes to robust solutions:

If your XML structure is straightforward (no nested tags with tricky characters, no CDATA sections), a regex can get the job done fast. It’ll strip all XML tags and clean up extra whitespace:

$rawString = '<?xml version=\'1.0\' encoding=\'UTF-8\'?><root available-locales="en_US" default-locale="en_US"><Title language-id="en_US">Batman</Title></root> <?xml version=\'1.0\' encoding=\'UTF-8\'?><root available-locales="en_US" default-locale="en_US"><Title language-id="en_US">Wonder Woman</Title></root>';

// Strip all XML tags
$strippedText = preg_replace('/<[^>]+>/', '', $rawString);
// Clean up extra spaces/newlines
$cleanText = trim(preg_replace('/\s+/', ' ', $strippedText));

echo $cleanText; // Output: Batman Wonder Woman

Note: This works for basic cases, but avoid it if your XML might contain edge cases like tags with attributes containing > characters or CDATA blocks—it can break the regex matching.

For a reliable solution that handles any valid XML structure, use PHP’s built-in DOMDocument. Since your string has multiple separate XML documents, we’ll first split them apart, then parse each one individually to extract text content:

$rawString = '<?xml version=\'1.0\' encoding=\'UTF-8\'?><root available-locales="en_US" default-locale="en_US"><Title language-id="en_US">Batman</Title></root> <?xml version=\'1.0\' encoding=\'UTF-8\'?><root available-locales="en_US" default-locale="en_US"><Title language-id="en_US">Wonder Woman</Title></root>';

// Split the string into individual XML snippets
$xmlSnippets = preg_split('/(<\?xml)/', $rawString, -1, PREG_SPLIT_NO_EMPTY | PREG_SPLIT_DELIM_CAPTURE);
$extractedTexts = [];

// Process each snippet
foreach ($xmlSnippets as $snippet) {
    // Reattach the <?xml prefix if it was split off
    if (strpos($snippet, '<?xml') !== 0) {
        $snippet = '<?xml' . $snippet;
    }

    // Suppress XML parsing warnings (in case of minor formatting issues)
    libxml_use_internal_errors(true);
    $dom = new DOMDocument();
    $dom->loadXML($snippet);
    libxml_clear_errors();

    // Extract and trim the text content
    $text = trim($dom->textContent);
    if (!empty($text)) {
        $extractedTexts[] = $text;
    }
}

// Combine all extracted text
$finalText = implode(' ', $extractedTexts);
echo $finalText; // Output: Batman Wonder Woman

Why this is better: It properly handles nested tags, attributes, and special characters that regex would mangle. It’s the go-to solution for production code where XML structure might vary.

If your XML snippets have a consistent, flat structure, SimpleXML offers a more concise syntax than DOMDocument:

$rawString = '<?xml version=\'1.0\' encoding=\'UTF-8\'?><root available-locales="en_US" default-locale="en_US"><Title language-id="en_US">Batman</Title></root> <?xml version=\'1.0\' encoding=\'UTF-8\'?><root available-locales="en_US" default-locale="en_US"><Title language-id="en_US">Wonder Woman</Title></root>';

$xmlSnippets = preg_split('/(<\?xml)/', $rawString, -1, PREG_SPLIT_NO_EMPTY | PREG_SPLIT_DELIM_CAPTURE);
$extractedTexts = [];

foreach ($xmlSnippets as $snippet) {
    if (strpos($snippet, '<?xml') !== 0) {
        $snippet = '<?xml' . $snippet;
    }

    libxml_use_internal_errors(true);
    $sxml = simplexml_load_string($snippet);
    libxml_clear_errors();

    if ($sxml) {
        $text = trim((string)$sxml);
        if (!empty($text)) {
            $extractedTexts[] = $text;
        }
    }
}

$finalText = implode(' ', $extractedTexts);
echo $finalText;

Note: This works great when your XML doesn’t have deeply nested elements, and you want code that’s easy to read and maintain.

内容的提问来源于stack exchange，提问作者dukenukem6487