What potential issues could arise when mixing HTML and PHP code in the same file?

One potential issue that could arise when mixing HTML and PHP code in the same file is that it can become difficult to maintain and debug the code, especially as the file grows in complexity. To solve this issue, it is recommended to separate the PHP logic from the HTML presentation by using PHP to generate the HTML dynamically.

<?php
// PHP logic to generate HTML dynamically
$items = ['Apple', 'Banana', 'Orange'];

foreach ($items as $item) {
    echo "<p>$item</p>";
}
?>