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@ -5,44 +5,215 @@ Internationalization (I18N) refers to the process of designing a software applic
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various languages and regions without engineering changes. For Web applications, this is of particular importance |
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because the potential users may be worldwide. |
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When developing an application it's assumed that we're relying on |
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[PHP internationalization extension](http://www.php.net/manual/en/intro.intl.php). While extension covers a lot of aspects |
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Yii adds a bit more: |
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Locale and Language |
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------------------- |
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- It handles message translation. |
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There are two languages defined in Yii application: [[\yii\base\Application::$sourceLanguage|source language]] and |
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[[\yii\base\Application::$language|target language]]. |
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Source language is the language original application messages are written in such as: |
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Locale and Language |
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------------------- |
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```php |
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echo \Yii::t('app', 'I am a message!'); |
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``` |
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> **Tip**: Default is English and it's not recommended to change it. The reason is that it's easier to find people translating from |
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> English to any language than from non-English to non-English. |
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Target language is what's currently used. It's defined in application configuration like the following: |
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```php |
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// ... |
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return array( |
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'id' => 'applicationID', |
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'basePath' => dirname(__DIR__), |
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'language' => 'ru_RU' // ← here! |
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``` |
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Later you can easily change it in runtime: |
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```php |
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\Yii::$app->language = 'zh_CN'; |
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``` |
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Basic message translation |
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------------------------- |
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### Strings translation |
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Yii basic message translation that works without additional PHP extension and |
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### Named placeholders |
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```php |
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$username = 'Alexander'; |
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echo \Yii::t('app', 'Hello, {username}!', array( |
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'username' => $username, |
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)); |
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``` |
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### Positional placeholders |
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```php |
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$sum = 42; |
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echo \Yii::t('app', 'Balance: {0}', $sum); |
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``` |
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> **Tip**: When messages are extracted and passed to translator, he sees strings only. For the code above extracted message will be |
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> "Balance: {0}". It's not recommended to use positional placeholders except when there's only one and message context is |
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> clear as above. |
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Advanced placeholder formatting |
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------------------------------- |
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In order to use advanced features you need to install and enable [intl](http://www.php.net/manual/en/intro.intl.php) PHP |
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extension. After installing and enabling it you will be able to use extended syntax for placeholders. Either short form |
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`{placeholderName, argumentType}` that means default setting or full form `{placeholderName, argumentType, argumentStyle}` |
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that allows you to specify formatting style. |
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Full reference is [available at ICU website](http://icu-project.org/apiref/icu4c/classMessageFormat.html) but since it's |
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a bit crypric we have our own reference below. |
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### Numbers |
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```php |
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$sum = 42; |
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echo \Yii::t('app', 'Balance: {0, number}', $sum); |
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``` |
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You can specify one of the built-in styles (`integer`, `currency`, `percent`): |
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```php |
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$sum = 42; |
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echo \Yii::t('app', 'Balance: {0, number, currency}', $sum); |
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``` |
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Or specify custom pattern: |
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```php |
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$sum = 42; |
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echo \Yii::t('app', 'Balance: {0, number, ,000,000000}', $sum); |
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``` |
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[Formatting reference](http://icu-project.org/apiref/icu4c/classicu_1_1DecimalFormat.html). |
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### Dates |
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```php |
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echo \Yii::t('app', 'Today is {0, date}', time()); |
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``` |
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Built in formats (`short`, `medium`, `long`, `full`): |
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```php |
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echo \Yii::t('app', 'Today is {0, date, short}', time()); |
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``` |
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Custom pattern: |
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```php |
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echo \Yii::t('app', 'Today is {0, date, YYYY-MM-dd}', time()); |
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``` |
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[Formatting reference](http://icu-project.org/apiref/icu4c/classicu_1_1SimpleDateFormat.html). |
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### Time |
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```php |
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echo \Yii::t('app', 'It is {0, time}', time()); |
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``` |
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Built in formats (`short`, `medium`, `long`, `full`): |
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```php |
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echo \Yii::t('app', 'It is {0, time, short}', time()); |
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``` |
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Custom pattern: |
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```php |
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echo \Yii::t('app', 'It is {0, date, HH:mm}', time()); |
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``` |
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[Formatting reference](http://icu-project.org/apiref/icu4c/classicu_1_1SimpleDateFormat.html). |
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### Spellout |
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```php |
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echo \Yii::t('app', '{n,number} is spelled as {n, spellout}', array( |
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'n' => 42, |
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)); |
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``` |
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### Ordinal |
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```php |
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echo \Yii::t('app', 'You are {n, ordinal} visitor here!', array( |
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'n' => 42, |
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)); |
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``` |
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Will produce "You are 42nd visitor here!". |
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### Duration |
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```php |
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echo \Yii::t('app', 'You are here for {n, duration} already!', array( |
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'n' => 42, |
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)); |
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``` |
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Will produce "You are here for 47 sec. already!". |
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### Plurals |
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Different languages have different ways to inflect plurals. Some rules are very complex so it's very handy that this |
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functionality is provided without the need to specify inflection rule. Instead it only requires your input of inflected |
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word in certain situations. |
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```php |
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echo \Yii::t('app', 'There {n, plural, =0{are no cats} =1{is one cat} other{are # cats}}!', array( |
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'n' => 0, |
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)); |
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``` |
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Will give us "There are no cats!". |
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In the plural rule arguments above `=0` means exactly zero, `=1` stands for exactly one `other` is for any other number. |
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`#` is replaced with the `n` argument value. It's not that simple for languages other than English. Here's an example |
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for Russian: |
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``` |
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Здесь {n, plural, =0{котов нет} =1{есть один кот} one{# кот} few{# кота} many{# котов} other{# кота}}! |
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``` |
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In the above it worth mentioning that `=1` matches exactly `n = 1` while `one` matches `21` or `101`. |
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To learn which inflection forms you should specify for your language you can referer to |
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[rules reference at unicode.org](http://unicode.org/repos/cldr-tmp/trunk/diff/supplemental/language_plural_rules.html). |
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### Selections |
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You can select phrases based on keywords. The pattern in this case specifies how to map keywords to phrases and |
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provides a default phrase. |
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```php |
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echo \Yii::t('app', '{name} is {gender} and {gender, select, female{she} male{he} other{it}} loves Yii!', array( |
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'name' => 'Snoopy', |
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'gender' => 'dog', |
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)); |
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``` |
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Will produce "Snoopy is dog and it loves Yii!". |
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In the expression `female` and `male` are possible values. `other` handler values that do not match. Strings inside |
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brackets are sub-expressions so could be just a string or a string with more placeholders. |
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Formatters |
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---------- |
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Translation |
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----------- |
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/* |
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numeric arg \{\s*\d+\s*\} |
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named arg \{\s*(\w|(\w|\d){2,})\s*\} |
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named placeholder can be unicode!!! |
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argName [^[[:Pattern_Syntax:][:Pattern_White_Space:]]]+ |
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message = messageText (argument messageText)* |
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argument = noneArg | simpleArg | complexArg |
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complexArg = choiceArg | pluralArg | selectArg | selectordinalArg |
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noneArg = '{' argNameOrNumber '}' |
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simpleArg = '{' argNameOrNumber ',' argType [',' argStyle] '}' |
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choiceArg = '{' argNameOrNumber ',' "choice" ',' choiceStyle '}' |
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pluralArg = '{' argNameOrNumber ',' "plural" ',' pluralStyle '}' |
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selectArg = '{' argNameOrNumber ',' "select" ',' selectStyle '}' |
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selectordinalArg = '{' argNameOrNumber ',' "selectordinal" ',' pluralStyle '}' |
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choiceStyle: see ChoiceFormat |
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pluralStyle: see PluralFormat |
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selectStyle: see SelectFormat |
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argNameOrNumber = argName | argNumber |
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argName = [^[[:Pattern_Syntax:][:Pattern_White_Space:]]]+ |
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argNumber = '0' | ('1'..'9' ('0'..'9')*) |
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argType = "number" | "date" | "time" | "spellout" | "ordinal" | "duration" |
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argStyle = "short" | "medium" | "long" | "full" | "integer" | "currency" | "percent" | argStyleText |
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*/ |
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In order to use formatters you need to install and enable [intl](http://www.php.net/manual/en/intro.intl.php) PHP |
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extension. |
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Alexander Makarov
11 years ago