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copied!<p>Here's sample data:</p> <pre><code>$in = ' <html> <head> <script type="text/javascript">window.location="somehwere";</script> <style> .someCSS {border:1px solid black;} </style> </head> <body> <p>....</p> <div> <script type="text/javascript">document.write("bad stuff");</script> </div> <ul> <li><style type="text/css">#moreCSS {font-weight:900;}</style></li> </ul> </body> </html>'; </code></pre> <p>And now the spelled-out version:</p> <pre><code>$dom = new DOMDocument('1.0','UTF-8'); $dom->loadHTML($in); removeByTag($dom,'style'); removeByTag($dom,'script'); var_dump($dom->saveHTML()); function removeByTag($dom,$tag) { $nodeList = $dom->getElementsByTagName($tag); removeAll($nodeList); } function removeAll($nodeList) { for ( $i = $nodeList->length; --$i >=0; ) { removeSelf($nodeList->item($i)); } } function removeSelf($node) { $node->parentNode->removeChild($node); } </code></pre> <p>And an alternate (does the same thing, just no function declarations):</p> <pre><code>$dom = new DOMDocument('1.0','UTF-8'); $dom->loadHTML($in); for ( $list = $dom->getElementsByTagName('script'), $i = $list->length; --$i >=0; ) { $node = $list->item($i); $node->parentNode->removeChild($node); } for ( $list = $dom->getElementsByTagName('style'), $i = $list->length; --$i >=0; ) { $node = $list->item($i); $node->parentNode->removeChild($node); } var_dump($dom->saveHTML()); </code></pre> <p>The trick is to <a href="http://us3.php.net/manual/en/class.domnodelist.php#83390" rel="nofollow">iterate <em>backwards</em> when deleting nodes</a>. And getElementsByTagName will traverse the entire DOM for you, so you don't have to (none of that hasChildNodes, nextSibling, nextChild stuff).</p> <p>Perhaps the best solution is somewhere in between those two extreme examples.</p> <hr> <p>Couldn't help myself, this is probably the best version of my suggestions. It doesn't include an incrementor (<code>$i</code>) to muck things up, and removes from the bottom-up:</p> <pre><code>$dom = new DOMDocument('1.0','UTF-8'); $dom->loadHTML($in); removeElementsByTagName($dom,'script'); removeElementsByTagName($dom,'style'); function removeElementsByTagName($dom,$tagName) { $list = $dom->getElementsByTagName($tagName); while ( $node = $list->item(0) ) { $node->parentNode->removeChild($node); } } var_dump($dom->saveHTML()); </code></pre> <p>As you remove nodes, they get moved up in the child list of the parent, so 1 becomes 0 and 2 becomes 1, etc. Keep doing this (<code>while</code>) until there aren't anymore (<a href="http://us1.php.net/manual/en/domnodelist.item.php" rel="nofollow"><code>->item</code> returns null</a>). Also wrapped this in a reusable function.</p>

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