source: extensions/ContestResults/include/cutstring.class.php @ 32013

<?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;
        }
}
?>