Blogger doesn't support the PHP, but using the element "object" you can override the problem.
Example:
<object width="400" height="300" type="text/html" data="url_your_file_php.php"></object>
Alternatives:
<embed width="400" height="300" type="text/html" data="url_your_file_php.php"></embed>
<script src='url_your_file_php.php' type='text/javascript'></script>
