How can invalid HTML resulting from PHP code affect the functionality of a webpage?

Invalid HTML resulting from PHP code can affect the functionality of a webpage by causing rendering issues, broken layouts, and unexpected behavior in browsers. To solve this issue, it is important to ensure that the PHP code generates valid HTML output by properly closing tags, using correct syntax, and avoiding inline styles or scripts that may conflict with the HTML structure. 

<?php
// Example of generating valid HTML output in PHP
echo "<html>";
echo "<head>";
echo "<title>Valid HTML Example</title>";
echo "</head>";
echo "<body>";
echo "<h1>Hello, World!</h1>";
echo "</body>";
echo "</html>";
?>

Keywords

HTML PHP code functionality webpage invalid.

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