Supported Versions: PHP 4, PHP 5, PHP 7, PHP 8
Finds whether a variable is an array
<?php is_array(mixed $value): bool
<?php     public function where($parameter, ?string $regExp = null): RouteInterface

    {

        if (is_array($parameter)) {

            $this->parameterTypes['regExp'] = array_merge($this->parameterTypes['regExp'], $parameter);

        } else {

            if (null === $regExp) {