framework/web/UrlRule.php
public function parseRequest($manager, $request)
    {
        if ($this->mode === self::CREATION_ONLY) {
            return false;
        }

        if (!empty($this->verb) && !in_array($request->getMethod(), $this->verb, true)) {
            return false;
        }

        $suffix = (string) ($this->suffix === null ? $manager->suffix : $this->suffix);
        $pathInfo = $request->getPathInfo();
        $normalized = false;
        if ($this->hasNormalizer($manager)) {
            $pathInfo = $this->getNormalizer($manager)->normalizePathInfo($pathInfo, $suffix, $normalized);
        }
        if ($suffix !== '' && $pathInfo !== '') {
            $n = strlen($suffix);
            if (substr_compare($pathInfo, $suffix, -$n, $n) === 0) {
                $pathInfo = substr($pathInfo, 0, -$n);
                if ($pathInfo === '') {
                    // suffix alone is not allowed
                    return false;
                }
            } else {
                return false;
            }
        }

        if ($this->host !== null) {
            $pathInfo = strtolower($request->getHostInfo()) . ($pathInfo === '' ? '' : '/' . $pathInfo);
        }

        if (!preg_match($this->pattern, $pathInfo, $matches)) {
            return false;
        }
        $matches = $this->substitutePlaceholderNames($matches);

        foreach ($this->defaults as $name => $value) {
            if (!isset($matches[$name]) || $matches[$name] === '') {
                $matches[$name] = $value;
            }
        }
        $params = $this->defaults;
        $tr = [];
        foreach ($matches as $name => $value) {
            if (isset($this->_routeParams[$name])) {
                $tr[$this->_routeParams[$name]] = $value;
                unset($params[$name]);
            } elseif (isset($this->_paramRules[$name])) {
                $params[$name] = $value;
            }
        }
        if ($this->_routeRule !== null) {
            $route = strtr($this->route, $tr);
        } else {
            $route = $this->route;
        }

        Yii::debug("Request parsed with URL rule: {$this->name}", __METHOD__);

        if ($normalized) {
            // pathInfo was changed by normalizer - we need also normalize route
            return $this->getNormalizer($manager)->normalizeRoute([$route, $params]);
        }

        return [$route, $params];
    }
public function parseRequest($manager, $request)
    {
        if ($this->mode === self::CREATION_ONLY) {
            return false;
        }

        if (!empty($this->verb) && !in_array($request->getMethod(), $this->verb, true)) {
            return false;
        }

        $suffix = (string) ($this->suffix === null ? $manager->suffix : $this->suffix);
        $pathInfo = $request->getPathInfo();
        $normalized = false;
        if ($this->hasNormalizer($manager)) {
            $pathInfo = $this->getNormalizer($manager)->normalizePathInfo($pathInfo, $suffix, $normalized);
        }
        if ($suffix !== '' && $pathInfo !== '') {
            $n = strlen($suffix);
            if (substr_compare($pathInfo, $suffix, -$n, $n) === 0) {
                $pathInfo = substr($pathInfo, 0, -$n);
                if ($pathInfo === '') {
                    // suffix alone is not allowed
                    return false;
                }
            } else {
                return false;
            }
        }

        if ($this->host !== null) {
            $pathInfo = strtolower($request->getHostInfo()) . ($pathInfo === '' ? '' : '/' . $pathInfo);
        }

        if (!preg_match($this->pattern, $pathInfo, $matches)) {
            return false;
        }
        $matches = $this->substitutePlaceholderNames($matches);

        foreach ($this->defaults as $name => $value) {
            if (!isset($matches[$name]) || $matches[$name] === '') {
                $matches[$name] = $value;
            }
        }
        $params = $this->defaults;
        $tr = [];
        foreach ($matches as $name => $value) {
            if (isset($this->_routeParams[$name])) {
                $tr[$this->_routeParams[$name]] = $value;
                unset($params[$name]);
            } elseif (isset($this->_paramRules[$name])) {
                $params[$name] = $value;
            }
        }
        if ($this->_routeRule !== null) {
            $route = strtr($this->route, $tr);
        } else {
            $route = $this->route;
        }

        Yii::debug("Request parsed with URL rule: {$this->name}", __METHOD__);

        if ($normalized) {
            // pathInfo was changed by normalizer - we need also normalize route
            return $this->getNormalizer($manager)->normalizeRoute([$route, $params]);
        }

        return [$route, $params];
    }
Parses the given request and returns the corresponding route and parameters.
@param UrlManager $manager the URL manager
@param Request $request the request component
@return array|bool the parsing result. The route and the parameters are returned as an array.
If `false`, it means this rule cannot be used to parse this path info.