How can PHP developers avoid Parse Errors when mixing HTML and PHP code?

When mixing HTML and PHP code, PHP developers can avoid Parse Errors by properly closing PHP tags when transitioning between PHP and HTML code. This can be achieved by using the `<?php ?>` tags to encapsulate PHP code within an HTML document. Additionally, developers can use PHP's `echo` or `print` functions to output dynamic content within HTML elements.

&lt;!DOCTYPE html&gt;
&lt;html&gt;
&lt;head&gt;
    &lt;title&gt;Example&lt;/title&gt;
&lt;/head&gt;
&lt;body&gt;
    &lt;h1&gt;Welcome, &lt;?php echo &quot;User&quot;; ?&gt;!&lt;/h1&gt;
&lt;/body&gt;
&lt;/html&gt;