c()

/**
 * @throws Throwable
 *
 * This method is used to create a new promise.
 */
public static function c(callable $callback, bool $justGetResult = false): Promise;

Usually you just need to use like this:

$promise = new Promise(function($resolve, $reject) {
    $resolve("Hello World");
});

With the c() method, you can implement it briefly with the Arrow Promise type:

Promise::c(fn($resolve, $reject) => $resolve("Hello World"));

Even if you don't like the new Class() format, you can use it to make a promise at the top:

Promise::c(function($resolve, $reject) {
    $resolve("Hello World");
});