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Merge branch 'master' into docs-ja-2014-10-18

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Nobuo Kihara
2014-10-19 01:56:15 +09:00
parent 865100aecb 6ab10bcda7
commit e1319c9bb9
1 changed files with 18 additions and 13 deletions
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31
docs/guide/helper-overview.md
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@@ -15,12 +15,13 @@ use yii\helpers\Html;
echo Html::encode('Test > test');
```
> Note: To support [extending helper classes](#extending-helper-classes), Yii breaks each core helper class
> Note: To support [customizing helper classes](#customizing-helper-classes), Yii breaks each core helper class
into two classes: a base class (e.g. `BaseArrayHelper`) and a concrete class (e.g. `ArrayHelper`).
When you use a helper, you should only use the concrete version and never use the base class.
## Core Helper Classes
Core Helper Classes
-------------------
The following core helper classes are provided in the Yii releases:
@@ -39,19 +40,21 @@ The following core helper classes are provided in the Yii releases:
- VarDumper
## Extending Helper Classes
Customizing Helper Classes <a name="customizing-helper-classes"></a>
--------------------------
To custom a core helper class (e.g. `yii\helpers\ArrayHelper`), you should extend from its corresponding base class
(e.g. `yii\helpers\BaseArrayHelper`) and name your class the same as the corresponding concrete class
(e.g. `yii\helpers\ArrayHelper`), including its namespace.
To customize a core helper class (e.g. [[yii\helpers\ArrayHelper]]), you should create a new class extending
from the helpers corresponding base class (e.g. [[yii\helpers\BaseArrayHelper]]) and name your class the same
as the corresponding concrete class (e.g. [[yii\helpers\ArrayHelper]]), including its namespace. This class
will then be set up to replace the original implementation of the framework.
The following example shows how to customize the [[yii\helpers\ArrayHelper::merge()|merge()]] method of the
[[yii\helpers\ArrayHelper]] class:
```php
namespace yii\helpers;
<?php
use yii\helpers\BaseArrayHelper;
namespace yii\helpers;
class ArrayHelper extends BaseArrayHelper
{
@@ -62,14 +65,16 @@ class ArrayHelper extends BaseArrayHelper
}
```
Save your class in a file named `ArrayHelper.php`. The file can be in any directory, such as `@app/components`.
Save your class in a file named `ArrayHelper.php`. The file can be in any directory, for example `@app/components`.
Next, in your application's [entry script](structure-entry-scripts.md), add the following line of code
after including the `yii.php` file:
after including the `yii.php` file to tell the [Yii class autoloader](concept-autoloading.md) to load your custom
class instead of the original helper class from the framework:
```php
Yii::$classMap['yii\helpers\ArrayHelper'] = 'path/to/ArrayHelper.php';
Yii::$classMap['yii\helpers\ArrayHelper'] = '@app/components/ArrayHelper.php';
```
The above line instructs the [Yii class autoloader](concept-autoloading.md) to load your version of the helper
class, instead of the one included in the Yii releases.
Note that customizing of helper classes is only useful if you want to change the behavior of an existing function
of the helpers. If you want to add additional functions to use in your application you may better create a separate
helper for that.