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BaseYii.php
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BaseYii.php
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<?php
/**
* @link http://www.yiiframework.com/
* @copyright Copyright (c) 2008 Yii Software LLC
* @license http://www.yiiframework.com/license/
*/
namespace yii;
use yii\base\InvalidConfigException;
use yii\base\InvalidParamException;
use yii\base\UnknownClassException;
use yii\log\Logger;
/**
* Gets the application start timestamp.
*/
defined('YII_BEGIN_TIME') or define('YII_BEGIN_TIME', microtime(true));
/**
* This constant defines the framework installation directory.
*/
defined('YII_PATH') or define('YII_PATH', __DIR__);
/**
* This constant defines whether the application should be in debug mode or not. Defaults to false.
*/
defined('YII_DEBUG') or define('YII_DEBUG', false);
/**
* This constant defines in which environment the application is running. Defaults to 'prod', meaning production environment.
* You may define this constant in the bootstrap script. The value could be 'prod' (production), 'dev' (development), 'test', 'staging', etc.
*/
defined('YII_ENV') or define('YII_ENV', 'prod');
/**
* Whether the the application is running in production environment
*/
defined('YII_ENV_PROD') or define('YII_ENV_PROD', YII_ENV === 'prod');
/**
* Whether the the application is running in development environment
*/
defined('YII_ENV_DEV') or define('YII_ENV_DEV', YII_ENV === 'dev');
/**
* Whether the the application is running in testing environment
*/
defined('YII_ENV_TEST') or define('YII_ENV_TEST', YII_ENV === 'test');
/**
* This constant defines whether error handling should be enabled. Defaults to true.
*/
defined('YII_ENABLE_ERROR_HANDLER') or define('YII_ENABLE_ERROR_HANDLER', true);
/**
* BaseYii is the core helper class for the Yii framework.
*
* Do not use BaseYii directly. Instead, use its child class [[\Yii]] which you can replace to
* customize methods of BaseYii.
*
* @author Qiang Xue <[email protected]>
* @since 2.0
*/
class BaseYii
{
/**
* @var array class map used by the Yii autoloading mechanism.
* The array keys are the class names (without leading backslashes), and the array values
* are the corresponding class file paths (or path aliases). This property mainly affects
* how [[autoload()]] works.
* @see autoload()
*/
public static $classMap = [];
/**
* @var \yii\console\Application|\yii\web\Application the application instance
*/
public static $app;
/**
* @var array registered path aliases
* @see getAlias()
* @see setAlias()
*/
public static $aliases = ['@yii' => __DIR__];
/**
* @var array initial property values that will be applied to objects newly created via [[createObject]].
* The array keys are class names without leading backslashes "\", and the array values are the corresponding
* name-value pairs for initializing the created class instances. For example,
*
* ~~~
* [
* 'Bar' => [
* 'prop1' => 'value1',
* 'prop2' => 'value2',
* ],
* 'mycompany\foo\Car' => [
* 'prop1' => 'value1',
* 'prop2' => 'value2',
* ],
* ]
* ~~~
*
* @see createObject()
*/
public static $objectConfig = [];
/**
* @return string the version of Yii framework
*/
public static function getVersion()
{
return '2.0.0-dev';
}
/**
* Translates a path alias into an actual path.
*
* The translation is done according to the following procedure:
*
* 1. If the given alias does not start with '@', it is returned back without change;
* 2. Otherwise, look for the longest registered alias that matches the beginning part
* of the given alias. If it exists, replace the matching part of the given alias with
* the corresponding registered path.
* 3. Throw an exception or return false, depending on the `$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.
*
* @param string $alias the alias to be translated.
* @param boolean $throwException whether to throw an exception if the given alias is invalid.
* If this is false and an invalid alias is given, false will be returned by this method.
* @return string|boolean the path corresponding to the alias, false if the root alias is not previously registered.
* @throws InvalidParamException if the alias is invalid while $throwException is true.
* @see setAlias()
*/
public static function getAlias($alias, $throwException = true)
{
if (strncmp($alias, '@', 1)) {
// not an alias
return $alias;
}
$pos = strpos($alias, '/');
$root = $pos === false ? $alias : substr($alias, 0, $pos);
if (isset(static::$aliases[$root])) {
if (is_string(static::$aliases[$root])) {
return $pos === false ? static::$aliases[$root] : static::$aliases[$root] . substr($alias, $pos);
} else {
foreach (static::$aliases[$root] as $name => $path) {
if (strpos($alias . '/', $name . '/') === 0) {
return $path . substr($alias, strlen($name));
}
}
}
}
if ($throwException) {
throw new InvalidParamException("Invalid path alias: $alias");
} else {
return false;
}
}
/**
* 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.
* @param string $alias the alias
* @return string|boolean the root alias, or false if no root alias is found
*/
public static function getRootAlias($alias)
{
$pos = strpos($alias, '/');
$root = $pos === false ? $alias : substr($alias, 0, $pos);
if (isset(static::$aliases[$root])) {
if (is_string(static::$aliases[$root])) {
return $root;
} else {
foreach (static::$aliases[$root] as $name => $path) {
if (strpos($alias . '/', $name . '/') === 0) {
return $name;
}
}
}
}
return false;
}
/**
* 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.
*
* @param string $alias the alias name (e.g. "@yii"). It must start with a '@' character.
* It may contain the forward slash '/' which serves as boundary character when performing
* alias translation by [[getAlias()]].
* @param string $path the path corresponding to the alias. Trailing '/' and '\' characters
* will be trimmed. This can be
*
* - a directory or a file path (e.g. `/tmp`, `/tmp/main.txt`)
* - a URL (e.g. `http://www.yiiframework.com`)
* - a path alias (e.g. `@yii/base`). In this case, the path alias will be converted into the
* actual path first by calling [[getAlias()]].
*
* @throws InvalidParamException if $path is an invalid alias.
* @see getAlias()
*/
public static function setAlias($alias, $path)
{
if (strncmp($alias, '@', 1)) {
$alias = '@' . $alias;
}
$pos = strpos($alias, '/');
$root = $pos === false ? $alias : substr($alias, 0, $pos);
if ($path !== null) {
$path = strncmp($path, '@', 1) ? rtrim($path, '\\/') : static::getAlias($path);
if (!isset(static::$aliases[$root])) {
if ($pos === false) {
static::$aliases[$root] = $path;
} else {
static::$aliases[$root] = [$alias => $path];
}
} elseif (is_string(static::$aliases[$root])) {
if ($pos === false) {
static::$aliases[$root] = $path;
} else {
static::$aliases[$root] = [
$alias => $path,
$root => static::$aliases[$root],
];
}
} else {
static::$aliases[$root][$alias] = $path;
krsort(static::$aliases[$root]);
}
} elseif (isset(static::$aliases[$root])) {
if (is_array(static::$aliases[$root])) {
unset(static::$aliases[$root][$alias]);
} elseif ($pos === false) {
unset(static::$aliases[$root]);
}
}
}
/**
* 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](http://www.php-fig.org/psr/psr-4/)
* 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.
*
* @param string $className the fully qualified class name without a leading backslash "\"
* @throws UnknownClassException if the class does not exist in the class file
*/
public static function autoload($className)
{
if (isset(static::$classMap[$className])) {
$classFile = static::$classMap[$className];
if ($classFile[0] === '@') {
$classFile = static::getAlias($classFile);
}
} elseif (strpos($className, '\\') !== false) {
$classFile = static::getAlias('@' . str_replace('\\', '/', $className) . '.php', false);
if ($classFile === false || !is_file($classFile)) {
return;
}
} else {
return;
}
include($classFile);
if (YII_DEBUG && !class_exists($className, false) && !interface_exists($className, false) && !trait_exists($className, false)) {
throw new UnknownClassException("Unable to find '$className' in file: $classFile. Namespace missing?");
}
}
/**
* Creates a new object using the given configuration.
*
* The configuration can be either a string or an array.
* If a string, it is treated as the *object class*; if an array,
* it must contain a `class` element specifying the *object class*, and
* the rest of the name-value pairs in the array will be used to initialize
* the corresponding object properties.
*
* Below are some usage examples:
*
* ~~~
* $object = \Yii::createObject('app\components\GoogleMap');
* $object = \Yii::createObject([
* 'class' => 'app\components\GoogleMap',
* 'apiKey' => 'xyz',
* ]);
* ~~~
*
* This method can be used to create any object as long as the object's constructor is
* defined like the following:
*
* ~~~
* public function __construct(..., $config = []) {
* }
* ~~~
*
* The method will pass the given configuration as the last parameter of the constructor,
* and any additional parameters to this method will be passed as the rest of the constructor parameters.
*
* @param string|array $config the configuration. It can be either a string representing the class name
* or an array representing the object configuration.
* @return mixed the created object
* @throws InvalidConfigException if the configuration is invalid.
*/
public static function createObject($config)
{
static $reflections = [];
if (is_string($config)) {
$class = $config;
$config = [];
} elseif (isset($config['class'])) {
$class = $config['class'];
unset($config['class']);
} else {
throw new InvalidConfigException('Object configuration must be an array containing a "class" element.');
}
$class = ltrim($class, '\\');
if (isset(static::$objectConfig[$class])) {
$config = array_merge(static::$objectConfig[$class], $config);
}
if (($n = func_num_args()) > 1) {
/** @var \ReflectionClass $reflection */
if (isset($reflections[$class])) {
$reflection = $reflections[$class];
} else {
$reflection = $reflections[$class] = new \ReflectionClass($class);
}
$args = func_get_args();
array_shift($args); // remove $config
if (!empty($config)) {
$args[] = $config;
}
return $reflection->newInstanceArgs($args);
} else {
return empty($config) ? new $class : new $class($config);
}
}
/**
* Logs a trace message.
* Trace messages are logged mainly for development purpose to see
* the execution work flow of some code.
* @param string $message the message to be logged.
* @param string $category the category of the message.
*/
public static function trace($message, $category = 'application')
{
if (YII_DEBUG) {
static::$app->getLog()->log($message, Logger::LEVEL_TRACE, $category);
}
}
/**
* Logs an error message.
* An error message is typically logged when an unrecoverable error occurs
* during the execution of an application.
* @param string $message the message to be logged.
* @param string $category the category of the message.
*/
public static function error($message, $category = 'application')
{
static::$app->getLog()->log($message, Logger::LEVEL_ERROR, $category);
}
/**
* Logs a warning message.
* A warning message is typically logged when an error occurs while the execution
* can still continue.
* @param string $message the message to be logged.
* @param string $category the category of the message.
*/
public static function warning($message, $category = 'application')
{
static::$app->getLog()->log($message, Logger::LEVEL_WARNING, $category);
}
/**
* 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).
* @param string $message the message to be logged.
* @param string $category the category of the message.
*/
public static function info($message, $category = 'application')
{
static::$app->getLog()->log($message, Logger::LEVEL_INFO, $category);
}
/**
* 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');
* ~~~
* @param string $token token for the code block
* @param string $category the category of this log message
* @see endProfile()
*/
public static function beginProfile($token, $category = 'application')
{
static::$app->getLog()->log($token, Logger::LEVEL_PROFILE_BEGIN, $category);
}
/**
* 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.
* @param string $token token for the code block
* @param string $category the category of this log message
* @see beginProfile()
*/
public static function endProfile($token, $category = 'application')
{
static::$app->getLog()->log($token, Logger::LEVEL_PROFILE_END, $category);
}
/**
* Returns an HTML hyperlink that can be displayed on your Web page showing "Powered by Yii Framework" information.
* @return string an HTML hyperlink that can be displayed on your Web page showing "Powered by Yii Framework" information
*/
public static function powered()
{
return 'Powered by <a href="http://www.yiiframework.com/" rel="external">Yii Framework</a>';
}
/**
* 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:
*
* ```php
* $username = 'Alexander';
* echo \Yii::t('app', 'Hello, {username}!', ['username' => $username]);
* ```
*
* Further formatting of message parameters is supported using the [PHP intl extensions](http://www.php.net/manual/en/intro.intl.php)
* message formatter. See [[yii\i18n\I18N::translate()]] for more details.
*
* @param string $category the message category.
* @param string $message the message to be translated.
* @param array $params the parameters that will be used to replace the corresponding placeholders in the message.
* @param string $language the language code (e.g. `en-US`, `en`). If this is null, the current
* [[\yii\base\Application::language|application language]] will be used.
* @return string the translated message.
*/
public static function t($category, $message, $params = [], $language = null)
{
if (static::$app !== null) {
return static::$app->getI18n()->translate($category, $message, $params, $language ?: static::$app->language);
} else {
$p = [];
foreach ((array) $params as $name => $value) {
$p['{' . $name . '}'] = $value;
}
return ($p === []) ? $message : strtr($message, $p);
}
}
/**
* Configures an object with the initial property values.
* @param object $object the object to be configured
* @param array $properties the property initial values given in terms of name-value pairs.
* @return object the object itself
*/
public static function configure($object, $properties)
{
foreach ($properties as $name => $value) {
$object->$name = $value;
}
return $object;
}
/**
* 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.
* @param object $object the object to be handled
* @return array the public member variables of the object
*/
public static function getObjectVars($object)
{
return get_object_vars($object);
}
}