source code says Request::getMethod() is deprecated, what to use?

But if you're not using a paramater you still got this error.

Also it seems that some users would be triggered to uses a non-CodeIgniter function instead.
And that would not be the way to handle this case.

Made some adjustments:

PHP Code:

/**
 * Get the request method.
 *
 * @param boolean $upper Whether to return in upper or lower case.
 *
 * @return string
 *
 * The $upper functionality will be removed and this will revert to its PSR-7 equivalent
 *
 * @codeCoverageIgnore
 */
 public function getMethod(bool $upper = false): string
 {
    if (count(func_get_args()) > 0) {
         $warn = 'The $upper functionality will be removed and this will revert to its PSR-7 equivalent';
         trigger_error($warn, E_USER_DEPRECATED);
     }
     return ($upper) ? strtoupper($this->method) : strtolower($this->method);
 } 


And this trows this when using the $upper-param (in development environments) 


Seems a better way?