Strip tag with class, id or anything else in PHP

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/**
 * Strip tags by any identifier without regexp, and without heavy XML parsing.
 *
 * @param  string $html         Input HTML
 * @param  string $tag          Tag that is removed, example: <span class="some_class">
 * @param  string $tag_close    Closing of tag, example: </span>
 * @param  string $tag_family   Tag family, example: <span
 * @param  bool   $del_children Will it remove tag and it's ending or everything between the tag aswell
 * @return                      Processed HTML
 */
function strip_given($html, $tag = '<div>', $tag_close = '</div>', $tag_family = '<div', $del_children = TRUE) {
  $tag_len = strlen($tag);
 
  $p1 = -1;
  $p2 = 0;
  while ( ($p2! == false) && (($p1 = strpos($html, $tag, $p1+1)) !== false) ) {
    $level = 1;
    $p2 = $p1;
    $continue = true;
    while ($continue) {
      $p2 = strpos($html, $tag_close, $p2+1);
      if ($p2 === false) {
        $continue = false;
        $p2 = false;
      } else {
        $level = $level -1;
        $x = substr($html, $p1+$tag_len, $p2-$p1-$tag_len);
        $n = substr_count($x, $tag_family);
        if ($level+$n<=0) $continue = false;
      }
    }
    if ($p2 !== false) {
      // remove tag and its ending
      if($del_children === FALSE) {
        $html = substr_replace($html, '', $p2, strlen($tag_close));
        $html = substr_replace($html, '', $p1, $tag_len);
      }
      // delete tag contents aswell
      else {
        $html = substr_replace($html, '', $p1, $p2+($p1-strlen($tag_close)));
      }
    }
  }
 
  return $html;
}
 
//------------------------------------------------------------------------------------------------------------------
 
/**
 * Strip tags with regex and without heavy XML parsing.
 *
 * @param  string $str           Input HTML
 * @param  string $tags          Tag that is removed, example: span class="some_class"
 * @param  bool   $stripContent  Strip contesnt aswell
 * @return                       Processed HTML
 */
function strip_given($str, $tags, $stripContent = false) {
  $content = '';
  if (!is_array($tags)) {
    $tags = (strpos($str, '>') !== false ? explode('>', str_replace('<', '', $tags)) : array($tags));
    if(end($tags) == '') array_pop($tags);
  }
  foreach ($tags as $tag) {
    if ($stripContent) $content = '(.+</'.$tag.'(>|\s[^>]*>)|)';
    $str = preg_replace('#</?'.$tag.'(>|\s[^>]*>)'.$content.'#is', '', $str);
  }
  return $str;
}
Programming Language: PHP