Class yii\BaseYii

Class autoload loader.

This method is invoked automatically when PHP sees an unknown class. The method will attempt to include the class file according to the following procedure:

1. Search in $classMap;
2. If the class is namespaced (e.g. yii\base\Component), it will attempt to include the file associated with the corresponding path alias (e.g. @yii/base/Component.php);

This autoloader allows loading classes that follow the PSR-4 standard and have its top-level namespace or sub-namespaces defined as path aliases.

Example: When aliases @yii and @yii/bootstrap are defined, classes in the yii\bootstrap namespace will be loaded using the @yii/bootstrap alias which points to the directory where bootstrap extension files are installed and all classes from other yii namespaces will be loaded from the yii framework directory.

Also the guide section on autoloading.

Marks the beginning of a code block for profiling.

This has to be matched with a call to endProfile() with the same category name. The begin- and end- calls must also be properly nested. For example,

\Yii::beginProfile('block1');
// some code to be profiled
    \Yii::beginProfile('block2');
    // some other code to be profiled
    \Yii::endProfile('block2');
\Yii::endProfile('block1');

See also endProfile().

Configures an object with the initial property values.

Creates a new object using the given configuration.

You may view this method as an enhanced version of the new operator. The method supports creating an object based on a class name, a configuration array or an anonymous function.

Below are some usage examples:

// create an object using a class name
$object = Yii::createObject('yii\db\Connection');

// create an object using a configuration array
$object = Yii::createObject([
    'class' => 'yii\db\Connection',
    'dsn' => 'mysql:host=127.0.0.1;dbname=demo',
    'username' => 'root',
    'password' => '',
    'charset' => 'utf8',
]);

// create an object with two constructor parameters
$object = \Yii::createObject('MyClass', [$param1, $param2]);

Using dependency injection container, this method can also identify dependent objects, instantiate them and inject them into the newly created object.

See also yii\di\Container.

Logs a debug message.

Trace messages are logged mainly for development purpose to see the execution work flow of some code. This method will only log a message when the application is in debug mode.

Marks the end of a code block for profiling.

This has to be matched with a previous call to beginProfile() with the same category name.

See also beginProfile().

Logs an error message.

An error message is typically logged when an unrecoverable error occurs during the execution of an application.

Translates a path alias into an actual path.

The translation is done according to the following procedure:

1. If the given alias does not start with '@', it is returned back without change;
2. Otherwise, look for the longest registered alias that matches the beginning part of the given alias. If it exists, replace the matching part of the given alias with the corresponding registered path.
3. Throw an exception or return false, depending on the $throwException parameter.

For example, by default '@yii' is registered as the alias to the Yii framework directory, say '/path/to/yii'. The alias '@yii/web' would then be translated into '/path/to/yii/web'.

If you have registered two aliases '@foo' and '@foo/bar'. Then translating '@foo/bar/config' would replace the part '@foo/bar' (instead of '@foo') with the corresponding registered path. This is because the longest alias takes precedence.

However, if the alias to be translated is '@foo/barbar/config', then '@foo' will be replaced instead of '@foo/bar', because '/' serves as the boundary character.

Note, this method does not check if the returned path exists or not.

See the guide article on aliases for more information.

See also setAlias().

Returns the public member variables of an object.

This method is provided such that we can get the public member variables of an object. It is different from "get_object_vars()" because the latter will return private and protected variables if it is called within the object itself.

Returns the root alias part of a given alias.

A root alias is an alias that has been registered via setAlias() previously. If a given alias matches multiple root aliases, the longest one will be returned.

Returns a string representing the current version of the Yii framework.

Logs an informative message.

An informative message is typically logged by an application to keep record of something important (e.g. an administrator logs in).

Returns an HTML hyperlink that can be displayed on your Web page showing "Powered by Yii Framework" information.

Registers a path alias.

A path alias is a short name representing a long path (a file path, a URL, etc.) For example, we use '@yii' as the alias of the path to the Yii framework directory.

A path alias must start with the character '@' so that it can be easily differentiated from non-alias paths.

Note that this method does not check if the given path exists or not. All it does is to associate the alias with the path.

Any trailing '/' and '\' characters in the given path will be trimmed.

See the guide article on aliases for more information.

See also getAlias().

Sets the logger object.

Translates a message to the specified language.

This is a shortcut method of yii\i18n\I18N::translate().

The translation will be conducted according to the message category and the target language will be used.

You can add parameters to a translation message that will be substituted with the corresponding value after translation. The format for this is to use curly brackets around the parameter name as you can see in the following example:

$username = 'Alexander';
echo \Yii::t('app', 'Hello, {username}!', ['username' => $username]);

Further formatting of message parameters is supported using the PHP intl extensions message formatter. See yii\i18n\I18N::translate() for more details.

Alias of debug().

Logs a warning message.

A warning message is typically logged when an error occurs while the execution can still continue.