>Are Problems of colisions with a script writing in a file possible?
Absolutely.
>For exemple for a PHP script reading a file, and rewriting it with
>modifications, when it is called a lot of times simultaneously, are
>conflicts possible? (over-writing the modifications) or does each session
>of this script wait for the previous one to close the file before to
>handle it?
Only if you use file-locking to eliminate conflicts, see:
http:/php.net/manual/en/function.flock.php
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