Manual:$wgSessionHandler/de-formal

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<translate> Cookies</translate>: $wgSessionHandler
Used to set PHP's session.save_handler.
<translate> Introduced in version:</translate>1.16.0 (r49370)
<translate> Deprecated in version:</translate>1.27.0 (Gerrit change 267737; git #2257fe42)
<translate> Removed in version:</translate>1.33.0 (Gerrit change 489405; git #a38fe6cd)
<translate> Allowed values:</translate>(string) or null
<translate> Default value:</translate>null (1.18-1.32)
'files' (1.16-1.17)

Details

This is used for setting PHP's session.save_handler. In practice, you will almost never need to change this ever. Other options might be 'user' or 'session_mysql'.

Setting to null skips setting this entirely (which might be useful if you're doing cross-application sessions, see bug 11381).