On Tue, 20 Feb 2001 08:50, Matthew Toledo wrote:
> Hello, I am just starting to use PHP. I have been using PERL for quite
> some time. I was wondering if there is any specific FILE LOCKING I
> need to implement to keep more than one person from altering a text
> file at the same time.
>
> For instance, in PERL, you use the flock command to set up an advisory
> file lock. Lets say that if I have a web page with a text based
> database, and more than one person wants to write to the file at the
> same time. In perl, if you use flock(FILE, 2). This causes person A
> to wait while person B writes to the file. flock(FILE, 8) unlocks the
> file. Then person A is allowed to write to the file.
>
> Does the perl equivalent of flock happen automatically in PHP?
>
> If not, how do you lock a file?
>
> Is it an advisory lock, or will it cause an error if two people try to
> access the same file at the same time for the same purpose (writing).
>
> Thanks,
The flock() function in PHP seems to do pretty much what you are looking
for - it allows setting a shared or exclusive lock and you can control
blocking while locking (at least according to the manual!)
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