public RouteMatchInterface::getParameter($parameter_name)
Returns the processed value of a named route parameter.
Raw URL parameters are processed by the parameter conversion system, which does operations such as converting entity ID parameters to fully-loaded entities. For example, the path node/12345 would have a raw node ID parameter value of 12345, while the processed parameter value would be the corresponding loaded node object.
string $parameter_name: The parameter name.
mixed|null The parameter value. NULL if the route doesn't define the parameter or if the parameter value can't be determined from the request.
\Drupal\Core\Routing\RouteMatchInterface::getRawParameter()
public function getParameter($parameter_name);
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https://api.drupal.org/api/drupal/core!lib!Drupal!Core!Routing!RouteMatchInterface.php/function/RouteMatchInterface::getParameter/8.1.x