It may not be a direct answer to your question, but...
You could just use flock() to lock the file while accessing it.

louis

2011/4/4 Paul M Foster <pa...@quillandmouse.com>:
> 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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