How to echo values in forms - php

Question

I am echo values by the codes below. but i want to create for each values form for saving to database.
How can i insert form inside echo ?
I am beginer in php and i want form like this and it must replace with all echo values.
----FORM----
Thumbnail url :
url :
description:
submit Button
----FORM----
this is the code
foreach($posts as $post){
if ($post){
echo $post->thumbnail . "<br />";
echo $post->url . "<br />";
echo $post->description . "<br />";
}
}

Answer 1

I solved how to add.
foreach($posts as $post){
if ($post){
echo '<input id="title" class="form-control" type="text" name="title" value="'.htmlspecialchars($post->thumbnail).'">';
echo '<input id="teaser" class="form-control" type="text" name="teaser" value="'.htmlspecialchars($post->Url).'">';
echo '<input id="text" class="form-control" type="text" name="text" value="'.htmlspecialchars($post->description).'">';
echo '<button class="btn btn-primary" type="submit">add</button>';
}
}
this works fine... My second question is how i can add the code below codes to inside echo in a same way ?
i tried to add same way but (if isset line ) gives error
<input type="hidden" name="mode" value="news" />
<input type="hidden" name="edit_news_submit" value="true" />
<?php if(isset($edit_news['id'])): ?>
<input type="hidden" name="id" value="<?php echo $edit_news['id']; ?>" />
<?php endif; ?>