Returns the digits of the parameter value.
@api
string $key The parameter key:
mixed $default The default value if the parameter key does not exist:
boolean $deep If true, a path like foo[bar] will find deeper items:
string The filtered value
public function getDigits($key, $default = '', $deep = false) {
// we need to remove - and + because they're allowed in the filter
return str_replace(array(
'-',
'+',
), '', $this
->filter($key, $default, $deep, FILTER_SANITIZE_NUMBER_INT));
}