PHP - dom appendChild() - adding strings around selected html tags using PHP DOM

Question

I'm trying to run through some html and insert some custom tags around every instance of an "A" tag. I've got so far, but the last step of actually appending my pseudotags to the link tags is eluding me, can anyone offer some guidance?

It all works great up until the last line of code - which is where I'm stuck. How do I place these pseudotags either side of the selected "A" tag?

$dom = new domDocument;
$dom->loadHTML($section);
$dom->preserveWhiteSpace = false;
$ahrefs = $dom->getElementsByTagName('a');
foreach($ahrefs as $ahref) {
    $valueID = $ahref->getAttribute('name');
    $pseudostart = $dom->createTextNode('%%' . $valueID . '%%');
    $pseudoend = $dom->createTextNode('%%/' . $valueID . '%%');
    $ahref->parentNode->insertBefore($pseudostart, $ahref);
    $ahref->parentNode->appendChild($pseudoend);
    $expression[] = $valueID; //^$link_name[0-9a-z_()]{0,3}$
    $dom->saveHTML();
}
//$dom->saveHTML();

I'm hoping to get this to perform the following:

<a href="xxx" name="yyy">text</a>

turned into

%%yyy%%<a href="xxx" name="yyy">text</a>%%/yyy%%

But currently it doesn't appear to do anything - the page outputs, but there are no replacements or nodes added to the source.

OK updated the above completely to reflect the new situation - I really need to get this working, I can't see another way of doing it :) — MrFidge
– MrFidge, Commented Nov 26, 2009 at 10:33
You forgot to $pseudostart = $dom->createTextNode('%%' . $valueID . '%%'); etc. — jensgram
– jensgram, Commented Nov 26, 2009 at 10:55
How do you dump the DOM-tree back into a string? $dom->saveXML()? — jensgram
– jensgram, Commented Nov 26, 2009 at 17:22

jensgram · Accepted Answer · 2009-11-27 10:08:48Z

1

In order to make sure that the ahref node is wrapped...

foreach($ahrefs as $ahref) {
    $valueID = $ahref->getAttribute('name');
    $pseudostart = $dom->createTextNode('%%' . $valueID . '%%');
    $pseudoend = $dom->createTextNode('%%/' . $valueID . '%%');
    $ahref->parentNode->insertBefore($pseudostart, $ahref);
    $ahref->parentNode->insertBefore($ahref->cloneNode(true), $ahref); // Inserting cloned element (in order to insert $pseudoend immediately after)
    $ahref->parentNode->insertBefore($pseudoend, $ahref);
    $ahref->parentNode->removeChild($ahref); // Removing old element
}
print $dom->saveXML();

edited Nov 27, 2009 at 10:08

answered Nov 25, 2009 at 12:25

jensgram

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4 Comments

MrFidge Over a year ago

Hiya, I'm looking to find each complete A tag <a href="xx">description</a> and then put $pseudostart before the <a and $pseudoend after the </a>

jensgram Over a year ago

In that case you would probably want to add the "pseudo elements" as textNodes using insertBefore() and appendChild() (on the ahref's parent).

MrFidge Over a year ago

can you elaborate on how to do that? The PHP manual documentation is less than clear to me.

MrFidge Over a year ago

OK updated the above completely to reflect the new situation - I really need to get this working, I can't see another way of doing it :)

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