How should external JS/CSS files be properly included in PHP to ensure functionality?

When including external JS/CSS files in PHP, it's important to use the correct file paths to ensure functionality. To do this, you can use the PHP `echo` function to output the HTML `<script>` or `<link>` tags with the correct file paths. 

&lt;?php
echo &#039;&lt;script src=&quot;path/to/external.js&quot;&gt;&lt;/script&gt;&#039;;
echo &#039;&lt;link rel=&quot;stylesheet&quot; type=&quot;text/css&quot; href=&quot;path/to/external.css&quot;&gt;&#039;;
?&gt;

Keywords

external JS CSS include functionality

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