Fixes #2655: Arrayable and ArrayableTrait are incompatible for some PHP versions.

framework/base/Arrayable.php

@@ -8,7 +8,14 @@
 namespace yii\base;
 
 /**
- * Arrayable should be implemented by classes that need to be represented in array format.
+ * 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
@@ -16,8 +23,68 @@ namespace yii\base;
 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 ($field, $model) {
+	 *     // 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 () {
+	 *         return $this->first_name . ' ' . $this->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.
-	 * @return array the array representation of this object
+	 *
+	 * @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 boolean $recursive whether to recursively return array representation of embedded objects.
+	 * @return array the array representation of the object
 	 */
-	public function toArray();
+	public function toArray(array $fields = [], array $expand = [], $recursive = true);
 }

framework/base/ArrayableTrait.php

@@ -13,6 +13,10 @@ use yii\web\Link;
 use yii\web\Linkable;
 
 /**
+ * ArrayableTrait provides a common implementation of the [[Arrayable]] interface.
+ *
+ * ArrayableTrait implements [[toArray()]] by respecting the field definitions as declared
+ * in [[fields()]] and [[extraFields()]].
  *
  * @author Qiang Xue <qiang.xue@gmail.com>
  * @since 2.0

framework/base/ErrorException.php

@@ -15,7 +15,7 @@ use Yii;
  * @author Alexander Makarov <sam@rmcreative.ru>
  * @since 2.0
  */
-class ErrorException extends \ErrorException implements Arrayable
+class ErrorException extends \ErrorException
 {
 	/**
 	 * Constructs the exception.
@@ -93,32 +93,4 @@ class ErrorException extends \ErrorException implements Arrayable
 		];
 		return isset($names[$this->getCode()]) ? $names[$this->getCode()] : 'Error';
 	}
-
-	/**
-	 * Returns the array representation of this object.
-	 * @return array the array representation of this object.
-	 */
-	public function toArray()
-	{
-		return $this->toArrayRecursive($this);
-	}
-
-	/**
-	 * Returns the array representation of the exception and all previous exceptions recursively.
-	 * @param \Exception $exception object
-	 * @return array the array representation of the exception.
-	 */
-	protected function toArrayRecursive($exception)
-	{
-		$array = [
-			'type' => get_class($exception),
-			'name' => $exception instanceof self ? $exception->getName() : 'Exception',
-			'message' => $exception->getMessage(),
-			'code' => $exception->getCode(),
-		];
-		if (($prev = $exception->getPrevious()) !== null) {
-			$array['previous'] = $this->toArrayRecursive($prev);
-		}
-		return $array;
-	}
 }

framework/base/ErrorHandler.php

@@ -119,15 +119,8 @@ class ErrorHandler extends Component
 					'exception' => $exception,
 				]);
 			}
-		} elseif ($exception instanceof Arrayable) {
-			$response->data = $exception->toArray();
 		} else {
-			$response->data = [
-				'type' => get_class($exception),
-				'name' => 'Exception',
-				'message' => $exception->getMessage(),
-				'code' => $exception->getCode(),
-			];
+			$response->data = $this->convertExceptionToArray($exception);
 		}
 
 		if ($exception instanceof HttpException) {
@@ -140,6 +133,25 @@ class ErrorHandler extends Component
 	}
 
 	/**
+	 * Converts an exception into an array.
+	 * @param \Exception $exception the exception being converted
+	 * @return array the array representation of the exception.
+	 */
+	protected function convertExceptionToArray($exception)
+	{
+		$array = [
+			'type' => get_class($exception),
+			'name' => $exception instanceof \yii\base\Exception || $exception instanceof \yii\base\ErrorException ? $exception->getName() : 'Exception',
+			'message' => $exception->getMessage(),
+			'code' => $exception->getCode(),
+		];
+		if (($prev = $exception->getPrevious()) !== null) {
+			$array['previous'] = $this->convertExceptionToArray($prev);
+		}
+		return $array;
+	}
+
+	/**
 	 * Converts special characters to HTML entities.
 	 * @param string $text to encode.
 	 * @return string encoded original text.

framework/base/Exception.php

@@ -13,7 +13,7 @@ namespace yii\base;
  * @author Qiang Xue <qiang.xue@gmail.com>
  * @since 2.0
  */
-class Exception extends \Exception implements Arrayable
+class Exception extends \Exception
 {
 	/**
 	 * @return string the user-friendly name of this exception
@@ -22,32 +22,4 @@ class Exception extends \Exception implements Arrayable
 	{
 		return 'Exception';
 	}
-
-	/**
-	 * Returns the array representation of this object.
-	 * @return array the array representation of this object.
-	 */
-	public function toArray()
-	{
-		return $this->toArrayRecursive($this);
-	}
-
-	/**
-	 * Returns the array representation of the exception and all previous exceptions recursively.
-	 * @param \Exception $exception object
-	 * @return array the array representation of the exception.
-	 */
-	protected function toArrayRecursive($exception)
-	{
-		$array = [
-			'type' => get_class($exception),
-			'name' => $exception instanceof self ? $exception->getName() : 'Exception',
-			'message' => $exception->getMessage(),
-			'code' => $exception->getCode(),
-		];
-		if (($prev = $exception->getPrevious()) !== null) {
-			$array['previous'] = $this->toArrayRecursive($prev);
-		}
-		return $array;
-	}
 }

framework/data/Pagination.php

@@ -8,7 +8,6 @@
 namespace yii\data;
 
 use Yii;
-use yii\base\Arrayable;
 use yii\base\Object;
 use yii\web\Link;
 use yii\web\Linkable;
@@ -68,7 +67,7 @@ use yii\web\Request;
  * @author Qiang Xue <qiang.xue@gmail.com>
  * @since 2.0
  */
-class Pagination extends Object implements Linkable, Arrayable
+class Pagination extends Object implements Linkable
 {
 	const LINK_NEXT = 'next';
 	const LINK_PREV = 'prev';
@@ -317,19 +316,6 @@ class Pagination extends Object implements Linkable, Arrayable
 	}
 
 	/**
-	 * @inheritdoc
-	 */
-	public function toArray()
-	{
-		return [
-			'totalCount' => $this->totalCount,
-			'pageCount' => $this->getPageCount(),
-			'currentPage' => $this->getPage(),
-			'perPage' => $this->getPageSize(),
-		];
-	}
-
-	/**
 	 * Returns the value of the specified query parameter.
 	 * This method returns the named parameter value from [[params]]. Null is returned if the value does not exist.
 	 * @param string $name the parameter name

framework/helpers/BaseJson.php

@@ -91,7 +91,11 @@ class BaseJson
 			} elseif ($data instanceof Arrayable) {
 				$data = $data->toArray();
 			} else {
-				$data = get_object_vars($data);
+				$result = [];
+				foreach ($data as $name => $value) {
+					$result[$name] = $value;
+				}
+				$data = $result;
 			}
 
 			if ($data === []) {

framework/i18n/I18N.php

@@ -8,7 +8,6 @@
 namespace yii\i18n;
 
 use Yii;
-use yii\base\Arrayable;
 use yii\base\Component;
 use yii\base\InvalidConfigException;
 
@@ -104,11 +103,7 @@ class I18N extends Component
 	 */
 	public function format($message, $params, $language)
 	{
-		if ($params instanceof Arrayable) {
-			$params = $params->toArray();
-		} else {
-			$params = (array)$params;
-		}
+		$params = (array)$params;
 		if ($params === []) {
 			return $message;
 		}

framework/rest/Serializer.php

@@ -169,14 +169,33 @@ class Serializer extends Component
 				$this->collectionEnvelope => $models,
 			];
 			if ($pagination !== false) {
-				$result['_links'] = Link::serialize($pagination->getLinks());
-				$result['_meta'] = $pagination->toArray();
+				return array_merge($result, $this->serializePagination($pagination));
+			} else {
+				return $result;
 			}
-			return $result;
 		}
 	}
 
 	/**
+	 * Serializes a pagination into an array.
+	 * @param Pagination $pagination
+	 * @return array the array representation of the pagination
+	 * @see addPaginationHeader()
+	 */
+	protected function serializePagination($pagination)
+	{
+		return [
+			'_links' => Link::serialize($pagination->getLinks(true)),
+			'_meta' => [
+				'totalCount' => $pagination->totalCount,
+				'pageCount' => $pagination->getPageCount(),
+				'currentPage' => $pagination->getPage(),
+				'perPage' => $pagination->getPageSize(),
+			],
+		];
+	}
+
+	/**
 	 * Adds HTTP headers about the pagination to the response.
 	 * @param Pagination $pagination
 	 */

framework/web/CookieCollection.php

@@ -9,7 +9,6 @@ namespace yii\web;
 
 use Yii;
 use ArrayIterator;
-use yii\base\Arrayable;
 use yii\base\InvalidCallException;
 use yii\base\Object;
 
@@ -23,7 +22,7 @@ use yii\base\Object;
  * @author Qiang Xue <qiang.xue@gmail.com>
  * @since 2.0
  */
-class CookieCollection extends Object implements \IteratorAggregate, \ArrayAccess, \Countable, Arrayable
+class CookieCollection extends Object implements \IteratorAggregate, \ArrayAccess, \Countable
 {
 	/**
 	 * @var boolean whether this collection is read only.
@@ -167,17 +166,6 @@ class CookieCollection extends Object implements \IteratorAggregate, \ArrayAcces
 	}
 
 	/**
-	 * Returns the collection as a PHP array.
-	 * @return array the array representation of the collection.
-	 * The array keys are cookie names, and the array values are the corresponding
-	 * cookie objects.
-	 */
-	public function toArray()
-	{
-		return $this->_cookies;
-	}
-
-	/**
 	 * Returns whether there is a cookie with the specified name.
 	 * This method is required by the SPL interface `ArrayAccess`.
 	 * It is implicitly called when you use something like `isset($collection[$name])`.

framework/web/HeaderCollection.php

@@ -8,7 +8,6 @@
 namespace yii\web;
 
 use Yii;
-use yii\base\Arrayable;
 use yii\base\Object;
 use ArrayIterator;
 
@@ -22,7 +21,7 @@ use ArrayIterator;
  * @author Qiang Xue <qiang.xue@gmail.com>
  * @since 2.0
  */
-class HeaderCollection extends Object implements \IteratorAggregate, \ArrayAccess, \Countable, Arrayable
+class HeaderCollection extends Object implements \IteratorAggregate, \ArrayAccess, \Countable
 {
 	/**
 	 * @var array the headers in this collection (indexed by the header names)
@@ -161,16 +160,6 @@ class HeaderCollection extends Object implements \IteratorAggregate, \ArrayAcces
 	}
 
 	/**
-	 * Returns the collection as a PHP array.
-	 * @return array the array representation of the collection.
-	 * The array keys are header names, and the array values are the corresponding header values.
-	 */
-	public function toArray()
-	{
-		return $this->_headers;
-	}
-
-	/**
 	 * Returns whether there is a header with the specified name.
 	 * This method is required by the SPL interface `ArrayAccess`.
 	 * It is implicitly called when you use something like `isset($collection[$name])`.

framework/web/HttpException.php

@@ -58,15 +58,4 @@ class HttpException extends UserException
 			return 'Error';
 		}
 	}
-
-	/**
-	 * Returns the array representation of this object.
-	 * @return array the array representation of this object.
-	 */
-	public function toArray()
-	{
-		$array = parent::toArray();
-		$array['status'] = $this->statusCode;
-		return $array;
-	}
 }

framework/web/Link.php

@@ -7,7 +7,6 @@
 
 namespace yii\web;
 
-use yii\base\Arrayable;
 use yii\base\Object;
 
 /**
@@ -16,7 +15,7 @@ use yii\base\Object;
  * @author Qiang Xue <qiang.xue@gmail.com>
  * @since 2.0
  */
-class Link extends Object implements Arrayable
+class Link extends Object
 {
 	/**
 	 * The self link.
@@ -53,13 +52,6 @@ class Link extends Object implements Arrayable
 	 */
 	public $hreflang;
 
-	/**
-	 * @inheritdoc
-	 */
-	public function toArray()
-	{
-		return array_filter((array)$this);
-	}
 
 	/**
 	 * Serializes a list of links into proper array format.
@@ -71,7 +63,7 @@ class Link extends Object implements Arrayable
 		foreach ($links as $rel => $link) {
 			if (is_array($link)) {
 				foreach ($link as $i => $l) {
-					$link[$i] = $l instanceof self ? $l->toArray() : ['href' => $l];
+					$link[$i] = $l instanceof self ? array_filter((array)$l) : ['href' => $l];
 				}
 				$links[$rel] = $link;
 			} elseif (!$link instanceof self) {

framework/web/Session.php

@@ -8,7 +8,6 @@
 namespace yii\web;
 
 use Yii;
-use yii\base\Arrayable;
 use yii\base\Component;
 use yii\base\InvalidConfigException;
 use yii\base\InvalidParamException;
@@ -72,7 +71,7 @@ use yii\base\InvalidParamException;
  * @author Qiang Xue <qiang.xue@gmail.com>
  * @since 2.0
  */
-class Session extends Component implements \IteratorAggregate, \ArrayAccess, \Countable, Arrayable
+class Session extends Component implements \IteratorAggregate, \ArrayAccess, \Countable
 {
 	/**
 	 * @var string the name of the session variable that stores the flash message data.
@@ -600,15 +599,6 @@ class Session extends Component implements \IteratorAggregate, \ArrayAccess, \Co
 	}
 
 	/**
-	 * @return array the list of all session variables in array
-	 */
-	public function toArray()
-	{
-		$this->open();
-		return $_SESSION;
-	}
-
-	/**
 	 * Updates the counters for flash messages and removes outdated flash messages.
 	 * This method should only be called once in [[init()]].
 	 */

tests/unit/framework/base/ExceptionTest.php

-<?php
-namespace yiiunit\framework\base;
-
-use yiiunit\TestCase;
-use yii\base\UserException;
-use yii\base\InvalidCallException;
-
-
-class ExceptionTest extends TestCase
-{
-	public function testToArrayWithPrevious()
-	{
-		$e = new InvalidCallException('bar', 0 ,new InvalidCallException('foo'));
-		$array = $e->toArray();
-		$this->assertEquals('bar', $array['message']);
-		$this->assertEquals('foo', $array['previous']['message']);
-		
-		$e = new InvalidCallException('bar', 0, new UserException('foo'));
-		$array = $e->toArray();
-		$this->assertEquals('bar', $array['message']);
-		$this->assertEquals('foo', $array['previous']['message']);
-	}
-}