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added note about session GC config

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fixes #16516
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Carsten Brandt
2018-07-14 01:23:48 +02:00
parent cd0e0e71c1
commit 9ba5581fa4
1 changed files with 5 additions and 0 deletions
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docs/guide/runtime-sessions-cookies.md
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@ -141,6 +141,11 @@ session storage class without the need to modify your application code that uses
sure that the session has already been started by [[yii\web\Session::open()]]. This is because custom session storage
handlers are registered within this method.
> Note: If you use a custom session storage you may need to configure the session garbage collector explicitly.
Some installations of PHP (e.g. Debian) use a garbage collector probability of 0 and clean session files
offline in a cronjob. This process does not apply to your custom storage so you need to configure
[[yii\web\Session::$GCProbability]] to use a non-zero value.
To learn how to configure and use these component classes, please refer to their API documentation. Below is
an example showing how to configure [[yii\web\DbSession]] in the application configuration to use a database table
for session storage: