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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\base;
/**
* Arrayable is the interface that should be implemented by classes who want to support customizable representation of their instances.
*
* For example, if a class implements Arrayable, by calling [[toArray()]], an instance of this class
* can be turned into an array (including all its embedded objects) which can then be further transformed easily
* into other formats, such as JSON, XML.
*
* The methods [[fields()]] and [[extraFields()]] allow the implementing classes to customize how and which of their data
* should be formatted and put into the result of [[toArray()]].
*
* @author Qiang Xue <qiang.xue@gmail.com>
* @since 2.0
*/
interface Arrayable
{
/**
* Returns the list of fields that should be returned by default by [[toArray()]] when no specific fields are specified.
*
* A field is a named element in the returned array by [[toArray()]].
*
* This method should return an array of field names or field definitions.
* If the former, the field name will be treated as an object property name whose value will be used
* as the field value. If the latter, the array key should be the field name while the array value should be
* the corresponding field definition which can be either an object property name or a PHP callable
* returning the corresponding field value. The signature of the callable should be:
*
* ```php
* function ($model, $field) {
* // return field value
* }
* ```
*
* For example, the following code declares four fields:
*
* - `email`: the field name is the same as the property name `email`;
* - `firstName` and `lastName`: the field names are `firstName` and `lastName`, and their
* values are obtained from the `first_name` and `last_name` properties;
* - `fullName`: the field name is `fullName`. Its value is obtained by concatenating `first_name`
* and `last_name`.
*
* ```php
* return [
* 'email',
* 'firstName' => 'first_name',
* 'lastName' => 'last_name',
* 'fullName' => function ($model) {
* return $model->first_name . ' ' . $model->last_name;
* },
* ];
* ```
*
* @return array the list of field names or field definitions.
* @see toArray()
*/
public function fields();
/**
* Returns the list of additional fields that can be returned by [[toArray()]] in addition to those listed in [[fields()]].
*
* This method is similar to [[fields()]] except that the list of fields declared
* by this method are not returned by default by [[toArray()]]. Only when a field in the list
* is explicitly requested, will it be included in the result of [[toArray()]].
*
* @return array the list of expandable field names or field definitions. Please refer
* to [[fields()]] on the format of the return value.
* @see toArray()
* @see fields()
*/
public function extraFields();
/**
* Converts the object into an array.
*
* @param array $fields the fields that the output array should contain. Fields not specified
* in [[fields()]] will be ignored. If this parameter is empty, all fields as specified in [[fields()]] will be returned.
* @param array $expand the additional fields that the output array should contain.
* Fields not specified in [[extraFields()]] will be ignored. If this parameter is empty, no extra fields
* will be returned.
* @param bool $recursive whether to recursively return array representation of embedded objects.
* @return array the array representation of the object
*/
public function toArray(array $fields = [], array $expand = [], $recursive = true);
}