Escaping from HTML: Advanced escaping using conditions
<?php if ($expression == true): ?> This will show if the expression is true. <?php else: ?> Otherwise this will show. <?php endif; ?>
PHP will skip the blocks where the condition is not met, even though they are outside of the PHP open/close tags; PHP skips them according to the condition since the PHP interpreter will jump over blocks contained within a condition that is not met.
Advanced escaping using conditions