What are common reasons for HTML tags not rendering correctly in a PHP forum post?

Common reasons for HTML tags not rendering correctly in a PHP forum post include escaping of special characters, incorrect usage of PHP echo or print statements, and improper placement of HTML tags within PHP code. To solve this issue, make sure to properly escape special characters using functions like htmlspecialchars(), ensure that HTML tags are placed outside of PHP code blocks, and use PHP echo or print statements to output HTML content.

// Example code snippet to output HTML content in a PHP forum post
$post_content = "<p>This is a forum post with <strong>HTML</strong> content.</p>";
echo $post_content;