Are there any specific PHP operators or functions that should be used when concatenating strings for HTML output?

When concatenating strings for HTML output in PHP, it is recommended to use the `htmlspecialchars()` function to escape special characters like `<`, `>`, `&`, etc. This helps prevent XSS attacks and ensures that the HTML output is properly rendered in the browser.

&lt;?php
// Example of concatenating strings for HTML output with proper escaping
$name = &quot;&lt;script&gt;alert(&#039;XSS attack&#039;);&lt;/script&gt;&quot;;
echo &quot;Hello, &quot; . htmlspecialchars($name);
?&gt;