What are the pitfalls of using "?>" within a string that is being parsed by PHP, and how can it lead to syntax errors?

Using "?>" within a string being parsed by PHP can lead to syntax errors because PHP will interpret it as the end of the PHP code block. To avoid this issue, you can escape the characters using a backslash (\) before the "?>" to ensure it is treated as a literal character within the string.

$string = 'Avoid syntax error by using \?> in the string';
echo $string;