trouble in removing the meta tag using php DOM api

$html = new DOMDocument();
           $html->loadHTMLFile($filename);

           $meta = $html->getElementsByTagName("meta");


           foreach($meta as $oldmeta_tags)
           {

               $parent = $oldmeta_tags->parentNode;
            开发者_StackOverflow   $parent->removeChild($oldmeta_tags);

           }
         echo "<br>Number of bytes stored = ".$html->saveHTMLFile($filename);
           $result[] = file_get_contents($filename);

Some of the meta tags are removed and some are not. please help what i am doing wrong

When you use foreach to iterate over the DOMNodeList and remove an element, you are changing the DOMNodeList content, so nodes will be skipped. You have to iterate backwards:

$nodes = $dom->getElementsByTagName('meta');
for ($i = $nodes->length - 1; $i >= 0; $i--) {
    $nodes->item($i)->parentNode->removeChild($nodes->item($i));
}

You're looping over the array and removing from it at the same time.

Unfortunately, this means that every time you remove a child inside the loop, the next loop iteration skips a node. foreach is not "clever enough" in conjunction with DOMDocument to do this intelligently.

Instead of foreach, use indexes:

$meta = $html->getElementsByTagName("meta");
for ($i = $meta->length - 1; $i >= 0; $i--) { // `foreach` breaks the `removeChild`
   $child = $meta->item($i);
   $child->parentNode->removeChild($child);
}