source: extensions/ContestResults/include/cutstring.class.php @ 6782

<?php
// Author prajwala
// email  m.prajwala@gmail.com
// Date   12/04/2009
// version 1.0

class HtmlCutString{
  function __construct($string, $limit){
    // create dom element using the html string
    $this->tempDiv = new DomDocument;
    $this->tempDiv->loadXML('<div>'.$string.'</div>');
    // keep the characters count till now
    $this->charCount = 0;
    $this->encoding = 'UTF-8';
    // character limit need to check
    $this->limit = $limit;
  }
  function cut(){
    // create empty document to store new html
    $this->newDiv = new DomDocument;
    // cut the string by parsing through each element
    $this->searchEnd($this->tempDiv->documentElement,$this->newDiv);
    $newhtml = $this->newDiv->saveHTML();
    return $newhtml;
  }

  function deleteChildren($node) {
    while (isset($node->firstChild)) {
      $this->deleteChildren($node->firstChild);
      $node->removeChild($node->firstChild);
    }
  } 
  function searchEnd($parseDiv, $newParent){
    foreach($parseDiv->childNodes as $ele){
        // not text node
        if($ele->nodeType != 3){
          $newEle = $this->newDiv->importNode($ele,true);
          if(count($ele->childNodes) === 0){
            $newParent->appendChild($newEle);
            continue;
          }
          $this->deleteChildren($newEle);
          $newParent->appendChild($newEle);
            $res = $this->searchEnd($ele,$newEle);
            if($res)
                        return $res;
            else
                        continue;
        }

        // the limit of the char count reached
        if(mb_strlen($ele->nodeValue,$this->encoding) + $this->charCount >= $this->limit){
          $newEle = $this->newDiv->importNode($ele);
            $newEle->nodeValue = substr($newEle->nodeValue,0, $this->limit - $this->charCount);
            $newParent->appendChild($newEle);
            return true;
        }
        $newEle = $this->newDiv->importNode($ele);
        $newParent->appendChild($newEle);
        $this->charCount += mb_strlen($newEle->nodeValue,$this->encoding);
    }
    return false;
  }
}
?>