What steps can be taken to ensure proper validation of HTML code in relation to PHP functionality?

To ensure proper validation of HTML code in relation to PHP functionality, you can use PHP functions like `htmlspecialchars()` to escape special characters in user input before outputting it in HTML. This helps prevent cross-site scripting attacks and ensures that the HTML code remains valid. 

// Example PHP code snippet to properly validate HTML code in relation to PHP functionality
$user_input = "<script>alert('XSS attack!');</script>";
$validated_input = htmlspecialchars($user_input, ENT_QUOTES, 'UTF-8');
echo "<p>" . $validated_input . "</p>";

Keywords

HTML validation PHP functionality input validation error handling sanitization.

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