How can PHP variables be properly passed and recognized in HTML code for link generation?

To properly pass and recognize PHP variables in HTML code for link generation, you can use concatenation within the HTML code to insert the PHP variable values. This involves closing the PHP tag, adding the variable within the HTML code, and then reopening the PHP tag to continue with the script.

<?php
$variable = "example";
?>
<a href="example.php?id=<?php echo $variable; ?>">Link</a>