how can I delete a record from txt file

From: Date: Thu, 22 Jan 2004 08:45:33 +0000
Subject: how can I delete a record from txt file
Groups: php.db 
Request: Send a blank email to php-db+get-32580@lists.php.net to get a copy of this message
Hi; I take users from Active Directory with ldap functions and put them in a list menu. I have got two txt files. One of them hold the users which have got internet access and one of them holds the users which have got speedily internet access. Also may be a third file that hold the users which have got limited internet access. In my program I must write the selected users to these files. And may be sometimes I must delete some users from these files. How can delete a user from txt file. These files are also in use with some other programs.

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