How can the escape code "\n" be properly included in the PHP code for line replacement?

To properly include the escape code "\n" in PHP code for line replacement, you need to use double quotes ("") instead of single quotes (''). Double quotes allow for the interpretation of escape sequences like "\n" while single quotes do not. By using double quotes, you can ensure that the "\n" escape code is correctly processed as a newline character in the replacement string.

// Example PHP code snippet for line replacement with "\n" escape code
$originalString = "Hello, World!";
$newString = str_replace("Hello", "Goodbye\n", $originalString);

echo $newString;