Class yii\redis\Session

All Classes | Properties | Methods

Inheritance	yii\redis\Session » yii\web\Session
Available since extension's version	2.0
Source Code	https://github.com/yiisoft/yii2-redis/blob/master/src/Session.php

Redis Session implements a session component using redis as the storage medium.

Redis Session requires redis version 2.6.12 or higher to work properly.

It needs to be configured with a redis yii\redis\Connection that is also configured as an application component. By default it will use the redis application component.

To use redis Session as the session application component, configure the application as follows,

[
    'components' => [
        'session' => [
            'class' => 'yii\redis\Session',
            'redis' => [
                'hostname' => 'localhost',
                'port' => 6379,
                'database' => 0,
            ]
        ],
    ],
]

Or if you have configured the redis yii\redis\Connection as an application component, the following is sufficient:

[
    'components' => [
        'session' => [
            'class' => 'yii\redis\Session',
            // 'redis' => 'redis' // id of the connection application component
        ],
    ],
]

Public Properties

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Property	Type	Description	Defined By
$keyPrefix	string	A string prefixed to every cache key so that it is unique.	yii\redis\Session
$redis	yii\redis\Connection\|string\|array	The Redis yii\redis\Connection object or the application component ID of the Redis yii\redis\Connection.	yii\redis\Session
$useCustomStorage	boolean	Whether to use custom storage.	yii\redis\Session

Public Methods

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Method	Description	Defined By
destroySession()	Session destroy handler.	yii\redis\Session
getUseCustomStorage()	Returns a value indicating whether to use custom session storage.	yii\redis\Session
init()	Initializes the redis Session component.	yii\redis\Session
readSession()	Session read handler.	yii\redis\Session
writeSession()	Session write handler.	yii\redis\Session

Protected Methods

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Method	Description	Defined By
calculateKey()	Generates a unique key used for storing session data in cache.	yii\redis\Session

Property Details

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$keyPrefix public property

A string prefixed to every cache key so that it is unique. If not set, it will use a prefix generated from Application::id. You may set this property to be an empty string if you don't want to use key prefix. It is recommended that you explicitly set this property to some static value if the cached data needs to be shared among multiple applications.

public string $keyPrefix = null

$redis public property

The Redis yii\redis\Connection object or the application component ID of the Redis yii\redis\Connection. This can also be an array that is used to create a redis yii\redis\Connection instance in case you do not want do configure redis connection as an application component. After the Session object is created, if you want to change this property, you should only assign it with a Redis yii\redis\Connection object.

public yii\redis\Connection|string|array $redis = 'redis'

$useCustomStorage public property

Whether to use custom storage.

public boolean $useCustomStorage = null

Method Details

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calculateKey() protected method

Generates a unique key used for storing session data in cache.

protected string calculateKey ( $id )
$id	string	Session variable name
return	string	A safe cache key associated with the session variable name

Source code

                protected function calculateKey($id)
{
    return $this->keyPrefix . md5(json_encode([__CLASS__, $id]));
}

destroySession() public method

Session destroy handler.

Do not call this method directly.

public boolean destroySession ( $id )
$id	string	Session ID
return	boolean	Whether session is destroyed successfully

Source code

                public function destroySession($id)
{
    $this->redis->executeCommand('DEL', [$this->calculateKey($id)]);
    // @see https://github.com/yiisoft/yii2-redis/issues/82
    return true;
}

getUseCustomStorage() public method

Returns a value indicating whether to use custom session storage.

This method overrides the parent implementation and always returns true.

public boolean getUseCustomStorage ( )
return	boolean	Whether to use custom storage.

Source code

                public function getUseCustomStorage()
{
    return true;
}

init() public method

Initializes the redis Session component.

This method will initialize the $redis property to make sure it refers to a valid redis connection.

public void init ( )
throws	\yii\base\InvalidConfigException	if $redis is invalid.

Source code

                public function init()
{
    $this->redis = Instance::ensure($this->redis, Connection::className());
    if ($this->keyPrefix === null) {
        $this->keyPrefix = substr(md5(Yii::$app->id), 0, 5);
    }
    parent::init();
}

readSession() public method

Session read handler.

Do not call this method directly.

public string readSession ( $id )
$id	string	Session ID
return	string	The session data

Source code

                public function readSession($id)
{
    $data = $this->redis->executeCommand('GET', [$this->calculateKey($id)]);
    return $data === false || $data === null ? '' : $data;
}

writeSession() public method

Session write handler.

Do not call this method directly.

public boolean writeSession ( $id, $data )
$id	string	Session ID
$data	string	Session data
return	boolean	Whether session write is successful

Source code

                public function writeSession($id, $data)
{
    if ($this->getUseStrictMode() && $id === $this->_forceRegenerateId) {
        //Ignore write when forceRegenerate is active for this id
        return true;
    }
    return (bool) $this->redis->executeCommand('SET', [$this->calculateKey($id), $data, 'EX', $this->getTimeout()]);
}