Php - format double-quoted string from a class

I have a class that build my main navigation. Everything works fine except for the html output i get in the source code. In my class i got something like this:

public function getNav(){
   $output = "";
   foreach($nav as $key=>$value){
       $output .= "<li>开发者_开发百科;<a href='$value'>$key</a></li>\n";
   }
   return $output;
}

Then i show navigation in my template...

    <ul class="nav">
    <?php echo $site->getNav(); ?>
    </ul>

... and the html source look like this:

     <ul id="nav">
           <li><a href='index.php'><span>HOME</span></a></li>
<li><a href='page2.php'><span>PAGE 2</span></a></li>
<li><a href='page3.php'><span>PAGE 3</span></a></li>
     </ul>

This is probably irrelevant, i'm just trying to understand if i get this due to the double quoted or what...

---

This output has nothing to do with the doublequotes(except the linebreak, which you wouldn't have without them).

Are you sure that your template is

    <ul class="nav">
    <?php echo $site->getNav(); ?>
    </ul>

...and not

    <ul class="nav">
          <?php echo $site->getNav(); ?>
    </ul>

? That's the only mysterious thing I see.