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POPHP/MySQL website with users table, need to add usergroup functionality
 

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    <p>I have working website in PHP with a MySQL backend which has several tables for different purposes. This site is based on different parts or 'environments' like a bugtracker, project management, etc. There is one central 'users' database which has all the users with the associated details in them.</p> <p>In each of previously mentioned 'environments', which all have their own set of tables, it is possible to specify a user ID in certain fields. e.g. the bugtracker table has a column called <code>AssignedTo</code> which contains the user ID's of users to whom bugs have been assigned.</p> <p>The field type of these 'user ID' columns (like the <code>AssignedTo</code> example) is the same as the <code>UserId</code> field in the central users table, which is an unsigned, zerofilled INT(5) field.</p> <p>Now I have a request from the users of this site to also allow to specify user groups in certain of these user ID fields.</p> <p>So again reffering to the <code>AssignedTo</code> example, it should now be possible to also assigned a bug to a user group, instead of a specific user.</p> <p>What's the best way to do this regarding the PHP scripting and the database layout? Now I have all these fields set to the same type as the <code>UserId</code> of the central users table, which is INT(5). However my <code>UserGroupId</code> field in the UserGroups table, is of a different format, INT(3).</p> <p>I could make this field also into an INT(5) field, but that would not solve the 2nd issue I'm having: how to see whether the <code>AssignedTo</code> value is reffering to a specific user, or to a usergroup.</p> <p>I was thinking about make the UserGroupId field start from 99999 and counting downwards, while the UserId field is starting from 00001 and counting upwards, thus assuming that if the <code>AssignedTo</code> starts with 9, it's reffering to a usergroup. But this doesn't seem like a clean solution to me...</p> <p>Any better ideas? Thanks!</p>
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