FRONTEND_MVC/components/amp/AMPSpan.php

<?php
namespace app\components\amp;

use Yii;
use magyarandras\AMPConverter\TagConverterInterface;

class AMPSpan implements TagConverterInterface
{
    private $necessary_scripts = [];

    public function convert(\DOMDocument $doc)
    {
  /*      $query = '//div';

        $xpath = new \DOMXPath($doc);

        $entries = $xpath->query($query);

        $allowed_attributes = ['class', 'id'];

        foreach ($entries as $tag) {
            $div = $doc->createElement('div');
            $br = $doc->createElement('br');


            foreach ($allowed_attributes as $attribute) {
                if ($tag->hasAttribute($attribute)) {
                    $div->setAttribute($attribute, $tag->getAttribute($attribute));
                }
            }

            if ($tag->hasChildNodes()) {
                foreach ($tag->childNodes as $node) {
					$ch = $node->cloneNode(true);
					if( $ch->nodeName == 'div' && $ch->getAttribute('id') == 'inject'){
						//$div->removeChild($ch);
					}else{
						$div->appendChild( $ch );
					}
                }
            }
                

            $tag->parentNode->replaceChild($div, $tag);
        }*/
		$ahrefs = $doc->getElementsByTagName('span');
		foreach($ahrefs as $element){
			for ( $k = $element->attributes->length - 1; $k >= 0; --$k) {
				if( $element->attributes->item($k)->nodeName != 'id' &&  $element->attributes->item($k)->nodeName != 'class' ){
					$element->removeAttributeNode( $element->attributes->item($k));
				}
			}
		}
        return $doc;
    }

    public function getNecessaryScripts()
    {
        return $this->necessary_scripts;
    }
}