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@var, @param, @return meaning in php comment

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I often see comments like

/*** The database class to store PDO objects** @var object*/

What does @var mean?

And, i often see @param, @return too... What do they mean?


I've ever seen strange comment like this one below. Can you tell me what it mean?


/*** $Id$*/
Edited by terryds
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As far as I know, that's not PHP syntax and, since it's in a comment, it won't do anything at all. I think it's a convention for developers to know what's in the code.

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it's probably a take on javadoc notation



Edited by thescientist
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  • 2 weeks later...

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