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PHP __ (double underscore) means anything?

     
7:15 pm on Aug 21, 2005 (gmt 0)

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I open up some open source PHP codes, even I have been coding for sometime, but I am confused to see them using __ (double underscore)

What does it do?

7:19 am on Aug 22, 2005 (gmt 0)

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Well, it depends where double underscore is being used?

Some coders use underscore to identify some types of variables: $__constant, $simplevariable.

PHP itself has some use double underscore and usualy it means some *extra* or *magic* functionality:
[php.net...]