What best practices should be followed when incorporating PHP scripts into framed web pages to avoid functionality issues?

When incorporating PHP scripts into framed web pages, it is essential to ensure that the PHP code is executed before any HTML content is outputted. This is because PHP scripts need to be processed on the server-side before the browser renders the HTML content. To avoid functionality issues, it is recommended to place all PHP code at the top of the page within the <body> tag or in a separate PHP file that is included at the beginning of the page.

&lt;?php
// PHP code goes here
?&gt;
&lt;!DOCTYPE html&gt;
&lt;html&gt;
&lt;head&gt;
    &lt;title&gt;My Framed Web Page&lt;/title&gt;
&lt;/head&gt;
&lt;body&gt;
    &lt;?php
    // More PHP code or HTML content here
    ?&gt;
&lt;/body&gt;
&lt;/html&gt;