currency formating

From: Date: Tue, 01 Jan 2002 02:04:19 +0000
Subject: currency formating
Groups: php.db 
Request: Send a blank email to php-db+get-15288@lists.php.net to get a copy of this message
I have the following $number=47.7 I need this to be = 47.70 it must include the 2 didgets after the . how can i accomplish this

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