What potential issues can arise from using inline JavaScript in PHP code?

Potential issues that can arise from using inline JavaScript in PHP code include mixing concerns, making the code harder to read and maintain, and increasing the risk of security vulnerabilities. To solve this, it is recommended to separate JavaScript code from PHP code by using external JavaScript files or embedding JavaScript within HTML files.

<!DOCTYPE html>
<html>
<head>
    <title>Example Page</title>
    <script src="script.js"></script>
</head>
<body>
    <?php
    // PHP code here
    ?>
</body>
</html>