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Class yii\helpers\Url

Inheritanceyii\helpers\Url » yii\helpers\BaseUrl
Available since version2.0
Source Code https://github.com/yiisoft/yii2/blob/master/framework/helpers/Url.php

Url provides a set of static methods for managing URLs.

For more details and usage information on Url, see the guide article on url helpers.

Public Properties

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Property Type Description Defined By
$urlManager yii\web\UrlManager URL manager to use for creating URLs yii\helpers\BaseUrl

Public Methods

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Method Description Defined By
base() Returns the base URL of the current request. yii\helpers\BaseUrl
canonical() Returns the canonical URL of the currently requested page. yii\helpers\BaseUrl
current() Creates a URL by using the current route and the GET parameters. yii\helpers\BaseUrl
ensureScheme() Normalize the URL by ensuring it uses specified scheme. yii\helpers\BaseUrl
home() Returns the home URL. yii\helpers\BaseUrl
isRelative() Returns a value indicating whether a URL is relative. yii\helpers\BaseUrl
previous() Returns the URL previously remembered. yii\helpers\BaseUrl
remember() Remembers the specified URL so that it can be later fetched back by previous(). yii\helpers\BaseUrl
to() Creates a URL based on the given parameters. yii\helpers\BaseUrl
toRoute() Creates a URL for the given route. yii\helpers\BaseUrl

Protected Methods

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Method Description Defined By
getUrlManager() yii\helpers\BaseUrl
normalizeRoute() Normalizes route and makes it suitable for UrlManager. Absolute routes are staying as is while relative routes are converted to absolute ones. yii\helpers\BaseUrl

Method Details

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base() public static method

Defined in: yii\helpers\BaseUrl::base()

Returns the base URL of the current request.

public static string base ( $scheme false )
$scheme boolean|string

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).

                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;
}

            
canonical() public static method

Defined in: yii\helpers\BaseUrl::canonical()

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()]);
public static string canonical ( )
return string

The canonical URL of the currently requested page

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

            
current() public static method (available since version 2.0.3)

Defined in: yii\helpers\BaseUrl::current()

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,

// assume $_GET = ['id' => 123, 'src' => 'google'], current route is "post/view"

// /index.php?r=post%2Fview&id=123&src=google
echo Url::current();

// /index.php?r=post%2Fview&id=123
echo Url::current(['src' => null]);

// /index.php?r=post%2Fview&id=100&src=google
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:

// index.php?r=post%2Findex&PostSearchForm%5Bid%5D=100&PostSearchForm%5Bsrc%5D=google
echo Url::current([
    $postSearch->formName() => ['id' => 100, 'src' => 'google'],
]);
public static string current ( array $params = [], $scheme false )
$params array

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.

$scheme boolean|string

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).
return string

The generated URL

                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);
}

            
ensureScheme() public static method (available since version 2.0.11)

Defined in: yii\helpers\BaseUrl::ensureScheme()

Normalize the URL by ensuring it uses specified scheme.

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

public static string ensureScheme ( $url, $scheme )
$url string

The URL to process

$scheme string

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)

return string

The processed URL

                public static function ensureScheme($url, $scheme)
{
    if (static::isRelative($url) || !is_string($scheme)) {
        return $url;
    }
    if (strncmp($url, '//', 2) === 0) {
        // e.g. //example.com/path/to/resource
        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;
}

            
getUrlManager() protected static method (available since version 2.0.8)
protected static yii\web\UrlManager getUrlManager ( )
return yii\web\UrlManager

URL manager used to create URLs

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

            
home() public static method

Defined in: yii\helpers\BaseUrl::home()

Returns the home URL.

public static string home ( $scheme false )
$scheme boolean|string

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).
return string

Home URL

                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;
}

            
isRelative() public static method

Defined in: yii\helpers\BaseUrl::isRelative()

Returns a value indicating whether a URL is relative.

A relative URL does not have host info part.

public static boolean isRelative ( $url )
$url string

The URL to be checked

return boolean

Whether the URL is relative

                public static function isRelative($url)
{
    return strncmp($url, '//', 2) && strpos($url, '://') === false;
}

            
normalizeRoute() protected static method

Defined in: yii\helpers\BaseUrl::normalizeRoute()

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.

protected static string normalizeRoute ( $route )
$route string

The route. This can be either an absolute route or a relative route.

return string

Normalized route suitable for UrlManager

throws yii\base\InvalidArgumentException

a relative route is given while there is no active controller

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

            
previous() public static method

Defined in: yii\helpers\BaseUrl::previous()

Returns the URL previously remembered.

See also:

public static string|null previous ( $name null )
$name string|null

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

return string|null

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

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

            
remember() public static method

Defined in: yii\helpers\BaseUrl::remember()

Remembers the specified URL so that it can be later fetched back by previous().

See also:

public static void remember ( $url '', $name null )
$url string|array

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

$name string|null

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.

                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);
    }
}

            
to() public static method

Defined in: yii\helpers\BaseUrl::to()

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:

// /index.php?r=site%2Findex
echo Url::to(['site/index']);

// /index.php?r=site%2Findex&src=ref1#name
echo Url::to(['site/index', 'src' => 'ref1', '#' => 'name']);

// /index.php?r=post%2Findex     assume the alias "@posts" is defined as "/post/index"
echo Url::to(['@posts']);

// the currently requested URL
echo Url::to();

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

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

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

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

// //www.example.com/images/logo.gif
echo Url::to('@web/images/logo.gif', '');
public static string to ( $url '', $scheme false )
$url array|string

The parameter to be used to generate a valid URL

$scheme boolean|string

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).
return string

The generated URL

throws yii\base\InvalidArgumentException

a relative route is given while there is no active controller

                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)) {
        // turn relative URL into absolute
        $url = static::getUrlManager()->getHostInfo() . '/' . ltrim($url, '/');
    }
    return static::ensureScheme($url, $scheme);
}

            
toRoute() public static method

Defined in: yii\helpers\BaseUrl::toRoute()

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:

// generates: /index.php?r=site/index&param1=value1&param2=value2
['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,

// generates: /index.php?r=site/index&param1=value1#name
['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:

// /index.php?r=site%2Findex
echo Url::toRoute('site/index');

// /index.php?r=site%2Findex&src=ref1#name
echo Url::toRoute(['site/index', 'src' => 'ref1', '#' => 'name']);

// http://www.example.com/index.php?r=site%2Findex
echo Url::toRoute('site/index', true);

// https://www.example.com/index.php?r=site%2Findex
echo Url::toRoute('site/index', 'https');

// /index.php?r=post%2Findex     assume the alias "@posts" is defined as "post/index"
echo Url::toRoute('@posts');
public static string toRoute ( $route, $scheme false )
$route string|array

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']).

$scheme boolean|string

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).
return string

The generated URL

throws yii\base\InvalidArgumentException

a relative route is given while there is no active controller

                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);
}