foreach($dtp->CTags as $ctag)
  {
     if($ctag->GetName()=="img")
     {
         if($i==($npos-1)) $preSrc = trim($ctag->GetInnerText());
         if($i==($npos+1)) $nextSrc = trim($ctag->GetInnerText());
         $i++;
     }
  } 核心代碼就在這里了，一個foreach循環(huán)，自然要修改這里了，修改后如下： 
 
  foreach($dtp->CTags as $ctag)
  {
     if($ctag->GetName()=="img")
     {
         if($i==($npos-1)) $preSrc = trim($ctag->GetInnerText());
         if($i==($npos+1)) $nextSrc = trim($ctag->GetInnerText());
        if($i==$npos) $text = $ctag->GetAtt('text');
         $i++;
     }
  }