stripping first comma off and everything after

From: Date: Fri, 18 Jun 2010 20:03:52 +0000
Subject: stripping first comma off and everything after
Groups: php.general 
Request: Send a blank email to php-general+get-306247@lists.php.net to get a copy of this message
I'm querying data and have results such as a variable named $entries[$i]["dn"]: CN=NTPRTPS3-LANIER-LD335c-LH107-PPRNP9A92,OU=XXXXXXXXXXf,OU=XXXXXXXXXX,OU=XXXXXXXXXXXXX,DC=xxxxxxxx,DC=xxxxxxxxxx,DC=xxx Basically I need to strip off the first command everything after, so that I just have it display CN=NTPRTPS3-LANIER-LD335c-LH107-PPRNP9A92. I tried echo rtrim($entries[$i]["dn"],","); but that doesn't do anything. Any ideas?

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