File locking with PHP functions

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I'd like to know (from someone who knows the internals more than I do)
whether the following functions lock files and to what extent:

fopen($filename, 'w');

Does this function lock the file from writes until fclose()?
Does it lock from reads as well?

fopen($filename, 'r+');

Does this function lock the file from writes until fclose()?
Does it lock the file from reads as well?

file($filename);

Does this function lock the file from writes until finished?
Does it lock the file from reads as well?

All this is in the context of a Linux/Unix web server.

Paul

-- 
Paul M. Foster
http://noferblatz.com
http://quillandmouse.com

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