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<?php |
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/** |
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* @link http://www.yiiframework.com/ |
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* @copyright Copyright (c) 2008 Yii Software LLC |
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* @license http://www.yiiframework.com/license/ |
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*/ |
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namespace yii\web; |
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/** |
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* MultiFieldSession is the base class for session storage implementations with multi-field data storage support. |
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* |
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* With multi-field data storage, session data can be split between several fields in the storage record. |
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* Using such a storage allows saving particular session data into separated field, which then can be used |
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* to manipulate sessions in the way plain PHP does not allow. |
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* |
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* For example the ID of the authenticated user can be saved as separated column in the MySQL 'session' table, |
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* which allows to query all active sessions for a particular user or terminate them at will. |
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* |
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* Customizing of the session writing is performed via [[writeCallback]], reading via [[readCallback]]. |
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* |
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* While extending this class you should use [[composeFields()]] method - while writing the session data into the storage and |
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* [[extractData()]] - while reading session data from the storage. |
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* |
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* @property bool $useCustomStorage Whether to use custom storage. This property is read-only. |
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* |
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* @author Paul Klimov <[email protected]> |
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* @since 2.0.6 |
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*/ |
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abstract class MultiFieldSession extends Session |
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{ |
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/** |
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* @var callable a callback that will be called during session data reading. |
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* The signature of the callback should be as follows: |
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* |
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* ``` |
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* function ($fields) |
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* ``` |
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* |
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* where `$fields` is the storage field set for read session and `$session` is this session instance. |
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* If callback returns an array, it will be merged into the session data. |
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* |
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* For example: |
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* |
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* ```php |
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* function ($fields) { |
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* return [ |
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* 'expireDate' => Yii::$app->formatter->asDate($fields['expire']), |
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* ]; |
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* } |
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* ``` |
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*/ |
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public $readCallback; |
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/** |
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* @var callable a callback that will be called during session data writing. |
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* The signature of the callback should be as follows: |
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* |
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* ``` |
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* function ($session) |
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* ``` |
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* |
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* where `$session` is this session instance, this variable can be used to retrieve session data. |
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* Callback should return the actual fields set, which should be saved into the session storage. |
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* |
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* For example: |
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* |
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* ```php |
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* function ($session) { |
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* return [ |
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* 'user_id' => Yii::$app->user->id, |
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* 'ip' => $_SERVER['REMOTE_ADDR'], |
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* 'is_trusted' => $session->get('is_trusted', false), |
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* ]; |
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* } |
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* ``` |
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*/ |
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public $writeCallback; |
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/** |
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* Returns a value indicating whether to use custom session storage. |
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* This method overrides the parent implementation and always returns true. |
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* @return bool whether to use custom storage. |
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*/ |
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public function getUseCustomStorage() |
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{ |
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return true; |
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} |
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/** |
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* Composes storage field set for session writing. |
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* @param string $id Optional session id |
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* @param string $data Optional session data |
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* @return array storage fields |
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*/ |
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protected function composeFields($id = null, $data = null) |
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{ |
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$fields = $this->writeCallback ? call_user_func($this->writeCallback, $this) : []; |
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if ($id !== null) { |
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$fields['id'] = $id; |
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} |
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if ($data !== null) { |
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$fields['data'] = $data; |
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} |
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return $fields; |
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} |
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/** |
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* Extracts session data from storage field set. |
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* @param array $fields storage fields. |
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* @return string session data. |
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*/ |
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protected function extractData($fields) |
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{ |
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if ($this->readCallback !== null) { |
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if (!isset($fields['data'])) { |
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$fields['data'] = ''; |
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} |
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$extraData = call_user_func($this->readCallback, $fields); |
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if (!empty($extraData)) { |
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session_decode($fields['data']); |
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$_SESSION = array_merge((array) $_SESSION, (array) $extraData); |
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return session_encode(); |
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} |
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return $fields['data']; |
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} |
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return isset($fields['data']) ? $fields['data'] : ''; |
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} |
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} |
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yiisoft /
yii2
