Are there any common mistakes or oversights that could lead to issues with PHP code execution, such as missing opening and closing PHP tags?

One common mistake that could lead to issues with PHP code execution is forgetting to include opening and closing PHP tags. This can cause PHP code to be treated as plain text by the server, resulting in errors or unexpected output. To solve this issue, always make sure to properly enclose your PHP code within <?php and ?> tags.

&lt;?php
// Correct way to include PHP code
echo &quot;Hello, World!&quot;;
?&gt;