checking is session_start is already set

From: Date: Thu, 12 Jun 2003 01:46:25 +0000
Subject: checking is session_start is already set
Groups: php.general 
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dumb question but how can i check if i have loaded the session_start function without actually checking for a particular session variable , i need to know as to prevent it being called twise within my DB class which is seperate from my authentication class where session_start is set so then the DB class is independent from the authentication class and will start a session if one isnt already made

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