What are some common mistakes to avoid when structuring PHP code within HTML elements for proper display on a webpage?

One common mistake to avoid when structuring PHP code within HTML elements is not properly escaping the PHP code. This can lead to syntax errors or unexpected output on the webpage. To solve this issue, make sure to enclose PHP code within `<?php ?>` tags and use `echo` or `print` functions to output dynamic content.

&lt;div&gt;
    &lt;p&gt;&lt;?php echo &quot;Hello, World!&quot;; ?&gt;&lt;/p&gt;
&lt;/div&gt;