php - need ideas for remote authentication (Wordpress) -

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i need redirect authenticated users wordpress site #1 wordpress site #2, , have them authenticated site #2 when land there. iow, don't want them have authenticate twice because i've relocated app #1 #2. wordpress user tables replicated between 2 sites, may or may not within same domain.

any ideas on how accomplish this? (i can write wordpress plugins)

i don't know enough wordpress answer definitively, possible use openid in sso (single sign-on) model wherein 1 of wordpress sites (say wp1) acts openid provider wp2. once user agrees share credentials wp2 should logged in automatically. method of authentication stack exchange uses; if logged in on stackexchange.com automatically logged in on of other sites provided have account.

janrain provides library php openid i've heard things about, (although i've never used it, have used openid c#).


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