Syntax problem with html in PHP -

im getting syntax error on line of code , don't know correct formatting it.

this part i'm having problems -

echo "     <ul>";    foreach($photos $photo) {               $farm              = $photo['farm'];              $server            = $photo['server'];              $photo_id          = $photo['id'];              $secret            = $photo['secret'];              $photo_title       = $photo['title'];    <li><img src="http://farm'.$photo['farm'].'.static.flickr.com/'.$photo['server'].'/'.$photo['id'].'_'.$photo['secret'].'_t.jpg" alt="'.$photo['title'].'" ></li>   

the problem li tag. how can format properly?

per comments, mean have following last line:

echo '<li><img src="http://farm'.$photo['farm'].'.static.flickr.com/'.$photo['server'].'/'.$photo['id'].'_'.$photo['secret'].'_t.jpg" alt="'.$photo['title'].'" ></li>';