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BaseUrl, yii\helpers\BaseUrl | API Documentation for Yii 2.0

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Returns the base URL of the current request.

The URI scheme to use in the returned base URL:

• false (default): returning the base URL without host info.
• true: returning an absolute base URL whose scheme is the same as that in yii\web\UrlManager::$hostInfo.
• string: returning an absolute base URL with the specified scheme (either http, https or empty string for protocol-relative URL).

Source code

                public static function base($scheme = false)
{
    $url = static::getUrlManager()->getBaseUrl();
    if ($scheme !== false) {
        $url = static::getUrlManager()->getHostInfo() . $url;
        $url = static::ensureScheme($url, $scheme);
    }
    return $url;
}

            

Returns the canonical URL of the currently requested page.

The canonical URL is constructed using the current controller's yii\web\Controller::$route and yii\web\Controller::$actionParams. You may use the following code in the layout view to add a link tag about canonical URL:

$this->registerLinkTag(['rel' => 'canonical', 'href' => Url::canonical()]);

Source code

                public static function canonical()
{
    $params = Yii::$app->controller->actionParams;
    $params[0] = Yii::$app->controller->getRoute();
    return static::getUrlManager()->createAbsoluteUrl($params);
}

            

Creates a URL by using the current route and the GET parameters.

You may modify or remove some of the GET parameters, or add additional query parameters through the $params parameter. In particular, if you specify a parameter to be null, then this parameter will be removed from the existing GET parameters; all other parameters specified in $params will be merged with the existing GET parameters. For example,

echo Url::current();


echo Url::current(['src' => null]);


echo Url::current(['id' => 100]);

Note that if you're replacing array parameters with [] at the end you should specify $params as nested arrays. For a PostSearchForm model where parameter names are PostSearchForm[id] and PostSearchForm[src] the syntax would be the following:

echo Url::current([
    $postSearch->formName() => ['id' => 100, 'src' => 'google'],
]);

An associative array of parameters that will be merged with the current GET parameters. If a parameter value is null, the corresponding GET parameter will be removed.

The URI scheme to use in the generated URL:

• false (default): generating a relative URL.
• true: returning an absolute base URL whose scheme is the same as that in yii\web\UrlManager::$hostInfo.
• string: generating an absolute URL with the specified scheme (either http, https or empty string for protocol-relative URL).

The generated URL

Source code

                public static function current(array $params = [], $scheme = false)
{
    $currentParams = Yii::$app->getRequest()->getQueryParams();
    $currentParams[0] = '/' . Yii::$app->controller->getRoute();
    $route = array_replace_recursive($currentParams, $params);
    return static::toRoute($route, $scheme);
}

            

Normalize the URL by ensuring it uses specified scheme.

If the URL is relative or the scheme is not a string, normalization is skipped.

The URL to process

The URI scheme used in the URL (e.g. http or https). Use an empty string to create protocol-relative URL (e.g. //example.com/path)

The processed URL

Source code

                public static function ensureScheme($url, $scheme)
{
    if (static::isRelative($url) || !is_string($scheme)) {
        return $url;
    }
    if (strncmp($url, '//', 2) === 0) {
        
        return $scheme === '' ? $url : "$scheme:$url";
    }
    if (($pos = strpos($url, '://')) !== false) {
        if ($scheme === '') {
            $url = substr($url, $pos + 1);
        } else {
            $url = $scheme . substr($url, $pos);
        }
    }
    return $url;
}

            

Source code

                protected static function getUrlManager()
{
    return static::$urlManager ?: Yii::$app->getUrlManager();
}

            

Returns the home URL.

The URI scheme to use for the returned URL:

• false (default): returning a relative URL.
• true: returning an absolute base URL whose scheme is the same as that in yii\web\UrlManager::$hostInfo.
• string: returning an absolute URL with the specified scheme (either http, https or empty string for protocol-relative URL).

Home URL

Source code

                public static function home($scheme = false)
{
    $url = Yii::$app->getHomeUrl();
    if ($scheme !== false) {
        $url = static::getUrlManager()->getHostInfo() . $url;
        $url = static::ensureScheme($url, $scheme);
    }
    return $url;
}

            

Returns a value indicating whether a URL is relative.

A relative URL does not have host info part.

Source code

                public static function isRelative($url)
{
    return preg_match('~^[[:alpha:]][[:alnum:]+-.]*://|^//~', $url) === 0;
}

            

Normalizes route and makes it suitable for UrlManager. Absolute routes are staying as is while relative routes are converted to absolute ones.

A relative route is a route without a leading slash, such as "view", "post/view".

• If the route is an empty string, the current route will be used;
• If the route contains no slashes at all, it is considered to be an action ID of the current controller and will be prepended with yii\web\Controller::$uniqueId;
• If the route has no leading slash, it is considered to be a route relative to the current module and will be prepended with the module's uniqueId.

Starting from version 2.0.2, a route can also be specified as an alias. In this case, the alias will be converted into the actual route first before conducting the above transformation steps.

Source code

                protected static function normalizeRoute($route)
{
    $route = Yii::getAlias((string) $route);
    if (strncmp($route, '/', 1) === 0) {
        
        return ltrim($route, '/');
    }
    
    if (Yii::$app->controller === null) {
        throw new InvalidArgumentException("Unable to resolve the relative route: $route. No active controller is available.");
    }
    if (strpos($route, '/') === false) {
        
        return $route === '' ? Yii::$app->controller->getRoute() : Yii::$app->controller->getUniqueId() . '/' . $route;
    }
    
    return ltrim(Yii::$app->controller->module->getUniqueId() . '/' . $route, '/');
}

            

The named associated with the URL that was remembered previously. If not set, yii\web\User::getReturnUrl() will be used to obtain remembered URL.

The URL previously remembered. Null is returned if no URL was remembered with the given name and $name is not specified.

Source code

                public static function previous($name = null)
{
    if ($name === null) {
        return Yii::$app->getUser()->getReturnUrl();
    }
    return Yii::$app->getSession()->get($name);
}

            

The URL to remember. Please refer to to() for acceptable formats. If this parameter is not specified, the currently requested URL will be used.

The name associated with the URL to be remembered. This can be used later by previous(). If not set, yii\web\User::setReturnUrl() will be used with passed URL.

Source code

                public static function remember($url = '', $name = null)
{
    $url = static::to($url);
    if ($name === null) {
        Yii::$app->getUser()->setReturnUrl($url);
    } else {
        Yii::$app->getSession()->set($name, $url);
    }
}

            

Creates a URL based on the given parameters.

This method is very similar to toRoute(). The only difference is that this method requires a route to be specified as an array only. If a string is given, it will be treated as a URL. In particular, if $url is

• an array: toRoute() will be called to generate the URL. For example: ['site/index'], ['post/index', 'page' => 2]. Please refer to toRoute() for more details on how to specify a route.
• a string with a leading @: it is treated as an alias, and the corresponding aliased string will be returned.
• an empty string: the currently requested URL will be returned;
• a normal string: it will be returned as is.

When $scheme is specified (either a string or true), an absolute URL with host info (obtained from yii\web\UrlManager::$hostInfo) will be returned. If $url is already an absolute URL, its scheme will be replaced with the specified one.

Below are some examples of using this method:

echo Url::to(['site/index']);


echo Url::to(['site/index', 'src' => 'ref1', '#' => 'name']);


echo Url::to(['@posts']);


echo Url::to();


echo Url::to('@web/images/logo.gif');


echo Url::to('images/logo.gif');


echo Url::to('@web/images/logo.gif', true);


echo Url::to('@web/images/logo.gif', 'https');


echo Url::to('@web/images/logo.gif', '');

The parameter to be used to generate a valid URL

The URI scheme to use in the generated URL:

• false (default): generating a relative URL.
• true: returning an absolute base URL whose scheme is the same as that in yii\web\UrlManager::$hostInfo.
• string: generating an absolute URL with the specified scheme (either http, https or empty string for protocol-relative URL).

The generated URL

a relative route is given while there is no active controller

Source code

                public static function to($url = '', $scheme = false)
{
    if (is_array($url)) {
        return static::toRoute($url, $scheme);
    }
    $url = Yii::getAlias($url);
    if ($url === '') {
        $url = Yii::$app->getRequest()->getUrl();
    }
    if ($scheme === false) {
        return $url;
    }
    if (static::isRelative($url)) {
        
        $url = static::getUrlManager()->getHostInfo() . '/' . ltrim($url, '/');
    }
    return static::ensureScheme($url, $scheme);
}

            

Creates a URL for the given route.

This method will use yii\web\UrlManager to create a URL.

You may specify the route as a string, e.g., site/index. You may also use an array if you want to specify additional query parameters for the URL being created. The array format must be:

['site/index', 'param1' => 'value1', 'param2' => 'value2']

If you want to create a URL with an anchor, you can use the array format with a # parameter. For example,

['site/index', 'param1' => 'value1', '#' => 'name']

A route may be either absolute or relative. An absolute route has a leading slash (e.g. /site/index), while a relative route has none (e.g. site/index or index). A relative route will be converted into an absolute one by the following rules:

• If the route is an empty string, the current route will be used;
• If the route contains no slashes at all (e.g. index), it is considered to be an action ID of the current controller and will be prepended with yii\web\Controller::$uniqueId;
• If the route has no leading slash (e.g. site/index), it is considered to be a route relative to the current module and will be prepended with the module's uniqueId.

Starting from version 2.0.2, a route can also be specified as an alias. In this case, the alias will be converted into the actual route first before conducting the above transformation steps.

Below are some examples of using this method:

echo Url::toRoute('site/index');


echo Url::toRoute(['site/index', 'src' => 'ref1', '#' => 'name']);


echo Url::toRoute('site/index', true);


echo Url::toRoute('site/index', 'https');


echo Url::toRoute('@posts');

Use a string to represent a route (e.g. index, site/index), or an array to represent a route with query parameters (e.g. ['site/index', 'param1' => 'value1']).

The URI scheme to use in the generated URL:

• false (default): generating a relative URL.
• true: returning an absolute base URL whose scheme is the same as that in yii\web\UrlManager::$hostInfo.
• string: generating an absolute URL with the specified scheme (either http, https or empty string for protocol-relative URL).

The generated URL

a relative route is given while there is no active controller

Source code

                public static function toRoute($route, $scheme = false)
{
    $route = (array) $route;
    $route[0] = static::normalizeRoute($route[0]);
    if ($scheme !== false) {
        return static::getUrlManager()->createAbsoluteUrl($route, is_string($scheme) ? $scheme : null);
    }
    return static::getUrlManager()->createUrl($route);
}

            

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