Wrap DOM element in another DOM element in PHP_问答_开发者

I originally asked a question along these lines using Regex but was recommended to use the PHP DOM library instead... which is superior, but I am still stuck.

Basically, I want to wrap the contents of an <a> in a <span> if it is not already wrapped in <span>.

<?php
$input = <<<EOT
<html><head></head>
<body bgcolor="#393a36">
    <a href="#"><span style="color:#ffffff;">Link 1</span></a>
    <a href="#">Link 2</a>
    <a href="#"><img src="mypic.gif" />Image Link</a>
    <a href="#"><u>Underlined Link</u></a>
</body>
</html>
EOT;


$doc = new DOMDocument();
$doc->loadHTML($input);
$tags = $doc->getElementsByTagName('a');
foreach ($tags as $tag) {
    $spancount = $tag->getElementsByTagName("span")->length;
    if($spancount == 0){
        $content = nodeContent($tag);
        $element = $doc->createElement('span');
        $element->setAttribute('style','color:#ffffff;');
        $frag = $doc->createDocumentFragment();
        $frag->appendXML($content);
        $element->appendChild($frag);   
        $tag->nodeValue = ""; //clear node
        $tag->appendChild($element);
    }
}
echo $doc->saveHTML();

function nodeContent($n, $outer=false) { 
    $d = new DOMDocument('1.0'); 
    $d->formatOutput = true;
    $b = $d->importNode($n->cloneNode(true),true); 
    $d->appendChild($b);
    $h = $d->saveHTML(); 
    // remove outter tags 
    if (!$outer) $h = substr($h,strpos($h,'>')+1,-(strlen($n->nodeName)+4)); 
    return $h; 
}

It provides this output:

PHP Warning: DOMDocumentFragment::appendXML(): Entity: line 1: parser error : Premature end of data in tag img line 1 in /private/var/folders/78/78vHGigZHcuFeXB1KKJSb++++TI/-Tmp-/untitled_3xd..php on line 24
PHP Warning: DOMDocumentFragment::appendXML(): Image Link in /private/var/folders/78/78vHGigZHcuFeXB1KKJSb++++TI/-Tmp-/untitled_3xd..php on line 24 PHP Warning: DOMDocumentFragment::appendXML(): ^ in /private/var/folders/78/78vHGigZHcuFeXB1KKJSb++++TI/-Tmp-/untitled_3xd..php on line 24 PHP Warning: DOMNode::appendChild(): Document Fragment is empty in /private/var/folders/78/78vHGigZHcuFeXB1KKJSb++++TI/-Tmp-/untitled_3xd..php on line 25

<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.0 Transit开发者_StackOverflowional//EN" "http://www.w3.org/TR/REC-html40/loose.dtd">
<html>  
<head></head>  
<body bgcolor="#393a36">  
    <a href="#"><span style="color:#ffffff;">Link 1</span></a>  
    <a href="#"><span style="color:#ffffff;">Link 2</span></a>  
    <a href="#"><span style="color:#ffffff;"></span></a>  
    <a href="#"><span style="color:#ffffff;"><u>Underlined Link</u></span></a>  
</body>  
</html>

This mostly works, except that it is really picky, and as you can see it dies if here is an img (or similar) tag inside the a href.

What is the best way to make this work. I've been banging my head against for an embarrassing long time now.

EDIT

Based on feedback below, here is the revised code and output. Note that the text preceding the img tag isn't being wrapped for some reason. Any Ideas?

$doc = new DOMDocument();
$doc->loadHTML($input);
$tags = $doc->getElementsByTagName('a');
foreach ($tags as $tag) {
    $spancount = $tag->getElementsByTagName("span")->length;
    if($spancount == 0){
    $element = $doc->createElement('span');
    $element->setAttribute('style','color:#ffffff;');
    foreach ($tag->childNodes as $child) {
        $tag->removeChild($child);
        $element->appendChild($child);
    }
    $tag->appendChild($element);

    }
}
echo $doc->saveHTML();

Output:

<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN" "http://www.w3.org/TR/REC-html40/loose.dtd">
<html>
<head></head>
<body bgcolor="#393a36">
    <a href="#"><span style="color:#ffffff;">Link 1</span></a>
    <a href="#"><span style="color:#ffffff;">Link 2</span></a>
    <a href="#">Image Link<span style="color:#ffffff;"><img src="mypic.gif"></span></a>
    <a href="#"><span style="color:#ffffff;"><u>Underlined Link</u></span></a>
</body>
</html>

Why bother with re-creating the node? Why not just replace the node? (If I understand what you're trying to do)...

if($spancount == 0){
    $element = $doc->createElement('span');
    $element->setAttribute('style','color:#ffffff;');
    $tag->parentNode->replaceChild($element, $tag);
    $element->apendChild($tag);
}

Edit Whoops, it looks like you're trying to wrap everything under $tag in the span... Try this instead:

if($spancount == 0){
    $element = $doc->createElement('span');
    $element->setAttribute('style','color:#ffffff;');
    foreach ($tag->childNodes as $child) {
        $tag->removeChild($child);
        $element->appendChild($child);
    }
    $tag->appendChild($child);
}

Edit2 Based on your results, it looks like that foreach is not completing because of the node removal... Try replacing the foreach with this:

while ($tag->childNodes->length > 0) {
    $child = $tag->childNodes->item(0);
    $tag->removeChild($child);
    $element->appendChild($child);
}

This is great information, and sorry to come so late into the party, but there's one error for me... at the end:

$tag->appendChild($child);

should be

$tag->appendChild($element);

That's the only way I could get this to work.

Wrap DOM element in another DOM element in PHP

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