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Thread: note 78394 added to function.session-start




note 78394 added to function.session-start
user name
2007-10-10 01:13:08
Don't *ever* use /dev/random as a session entropy file,
because session_handler will hang for a *long* time after
open(). This configuration will be *the* overkill:

<?php
ini_set("session.entropy_file",
"/dev/random");
ini_set("session.entropy_length",
"512");
?>

Use /dev/urandom instead. The reason for this is (from
Wikipedia):

A counterpart to /dev/random is /dev/urandom
("unlimited" random source) which reuses the
internal pool to produce more pseudo-random bits. This means
that the call will not block, but the output may contain
less entropy than the corresponding read from /dev/random.

We spent 2 days on figuring this out. You have been warned.
----
Server IP: 217.20.138.73
Probable Submitter: 195.228.228.82
----
Manual Page -- http://www.php.net/manual/en/function.session-start.php
Edit        -- https://master
.php.net/note/edit/78394
Del: integrated  -- h
ttps://master.php.net/note/delete/78394/integrated
Del: useless     -- http
s://master.php.net/note/delete/78394/useless
Del: bad code    -- htt
ps://master.php.net/note/delete/78394/bad+code
Del: spam        -- https:/
/master.php.net/note/delete/78394/spam
Del: non-english -- 
https://master.php.net/note/delete/78394/non-english
Del: in docs     -- http
s://master.php.net/note/delete/78394/in+docs
Del: other reasons-- https://mast
er.php.net/note/delete/78394
Reject      -- https://mast
er.php.net/note/reject/78394
Search      -- https://
master.php.net/manage/user-notes.php

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