Bizarre implementation mixing FastRoute and my previous iteration

match.php

<?php

define('MATCH_ERR_OK', 0);
define('MATCH_ERR_NOT_FOUND', 1);
define('MATCH_ERR_METHOD_NOT_ALLOWED', 2);

function match(callable $handler): callable {
    $static = $dynamic = ['GET' => [], 'POST' => []];
    $routes = $handler(function(string $method, string $pattern) use(&$static, &$dynamic) {
        $method = strtoupper($method);
        if (!isset($static[$method])) { // or !isset($dynamic[$method])
            throw new \InvalidArgumentException('Invalid method');
        }

        $id = uniqid();
        if (preg_match_all('/\\(\\?P<(\w+)>[^\\)]+\\)/', $pattern, $matches)) {
            $dynamic[$method][$pattern] = [$id, call_user_func_array('array_merge', array_slice($matches, 1))];
        } else {
            $static[$method][$pattern] = [$id];
        }

        return $id;
    });

    return function(string $method) use($routes, $static, $dynamic): callable {
        $method = strtoupper($method);
        if ($method === 'HEAD') {
            $method = 'GET';
        }

        $varGroups = 0;
        $patterns = [];
        $datas = [];

        foreach ($dynamic[$method] as $pattern => $data) {
            $varCount = count($data[1]);
            $varGroups = max($varGroups, $varCount);

            $patterns[] = $pattern . str_repeat('()', $varGroups - $varCount);
            $datas[++$varGroups] = $data;
        }

        $static = $static[$method];
        $regex = '~^(?|' . implode('|', $patterns) . ')$~';

        return function(string $path) use($routes, $static, $regex, $datas) {
            if (isset($static[$path])) {
                return ['error' => MATCH_ERR_OK, 'match' => $routes[$static[$path][0]]];
            } elseif (preg_match($regex, $path, $matches)) {
                list($id, $vars) = $datas[floor(count($matches) / 2) + 1];

                $args = [];
                foreach ($vars as $i => $var) {
                    $args[$var] = $matches[$i + 1];
                }

                return ['error' => MATCH_ERR_OK, 'match' => $routes[$id], 'args' => $args];
            }

            foreach ($routes as $prefix => $route) {
                if (stristr($path, $prefix) === 0) {
                    $match = match($route)($req);
                    if ($match['error'] === MATCH_ERR_OK) {
                        return $match;
                    }
                }
            }

            return ['error' => MATCH_ERR_NOT_FOUND];
        };
    };
}