PHP foreach inside variable

So effectively I am after::

$list = get_posts('post_type=services&numberposts=-1');
    foreach ($list as $post) :
        $title = $post->post_title; 

And therefore the output from $return should look something like this

<li><a href="#content1" onClick="slide(this); return false" rel="catalogue_sevices_page">Title 1</a></li>
<li><a href="#content2" onClick="slide(this); return false" rel="catalogue_sevices_page">Title 2</a><开发者_如何学Python/li>
<li><a href="#content3" onClick="slide(this); return false" rel="catalogue_sevices_page">Title 3</a></li>

Any ideas,

you have to use concatenation to store data in a variable with in foreach loop

 $return .= '<li>....

and then return the $return variable before foreach end

 return $return;
endforeach;

Simply append with the .= operator.

$return = '';
$list = get_posts('post_type=services&numberposts=-1');
foreach ($list as $post) {
    $title = $post->post_title; 
    $return .= '<li>
                <a href="#main_content_inner" onClick="slide(this); return false" rel="catalogue_sevices_page">'.$title.'</a>
            </li>';
}
return $return;