How to insert a PHP script into attribute "selected" (HTML 5) - php

Question

I'm trying to insert a PHP script into a selected attribute in HTML5 ,but I have failed with syntax.
Error :"The value of selected attribute is made invalid because it's not supported by the current schema".
It looks like this... How can I solve this problem? Thanks.
<div>
<label>Select author here:</label>
<select name="author">
<option value="">Select an author</option>
<?php foreach ($authors as $author): ?>
<option value="<?php htmlout($author['id']);?>"
selected="<?php ?>">
<?php htmlout($author['name']);?>
</option>
<?php endforeach; ?>
</select>
</div>

Answer 1

try it :
<div>
<label>Select author here:</label>
<select name="author">
<option value="">Select an author</option>
<?php foreach ($authors as $author): ?>
<option value="<?php htmlout($author['id']);?>"
<?php echo $Your_Select_value == $author['id'] ? "selected" : '';?> >
<?php htmlout($author['name']);?>
</option>
<?php endforeach; ?>
</select>
</div>

Answer 2

Proper value of selected attribute is selected. Thus if you wish to apply this attribute to the option that you consider currently selected, try this (I assume that PHP variable that stores selected author's id is $authorid):
<div>
<label>Select author here:</label>
<select name="author">
<option value="">Select an author</option>
<?php foreach ($authors as $author): ?>
<option value="<?php htmlout($author['id']);?>"
<?php if ($author['id'] == $authorid) echo ('selected="selected"'); ?>
>
<?php htmlout($author['name']);?>
</option>
<?php endforeach; ?>
</select>
</div>