What are some alternative methods to include backslashes in JSON output in PHP?

When working with JSON output in PHP, backslashes can cause issues as they are escape characters in JSON. To include backslashes in JSON output, you can use the `JSON_UNESCAPED_SLASHES` option when encoding the data using `json_encode()`. This option will prevent PHP from escaping the backslashes in the JSON output.

$data = ["example" => "This is a backslash: \\"];
$json_output = json_encode($data, JSON_UNESCAPED_SLASHES);
echo $json_output;