What are the consequences of having an invalid HTML document when integrating PHP files?

Having an invalid HTML document when integrating PHP files can lead to rendering issues, broken functionality, and potential security vulnerabilities. To solve this issue, make sure to always have well-formed HTML structure with proper opening and closing tags, and ensure that PHP code is inserted correctly within the HTML document. 

<!DOCTYPE html>
<html>
<head>
    <title>Valid HTML with PHP</title>
</head>
<body>
    <?php
        // PHP code here
        echo "Hello, World!";
    ?>
</body>
</html>

Keywords

HTML PHP integration validation errors

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