src/core/Request.php
public function getParam(
        string $name,
        int $filter = \FILTER_DEFAULT,
        $options = null
    ) {
        // Can be useful when INPUT_REQUEST is implemented for the filter_input()
        // function.
        //return filter_input(\INPUT_REQUEST, $name, $filter, $options);
        return isset($_REQUEST[$name]) ? filter_var($_REQUEST[$name], $filter, $options)
            : null;
    }
public function getParam(
        string $name,
        int $filter = \FILTER_DEFAULT,
        $options = null
    ) {
        // Can be useful when INPUT_REQUEST is implemented for the filter_input()
        // function.
        //return filter_input(\INPUT_REQUEST, $name, $filter, $options);
        return isset($_REQUEST[$name]) ? filter_var($_REQUEST[$name], $filter, $options)
            : null;
    }
The method returns the parameter value of request by the passed key. It's
wrapper over the filter_var() function.
@param string $name Name of a variable to get.
@param int $filter
@param mixed $options Associative array of options or bitwise disjunction
of flags. If filter accepts options, flags can be provided in "flags"
field of array.
@return mixed Value of the requested variable on success, false if the filter
fails, or null if the variable is not set.