Re: [PHP] Very Large File Splatter

2013/2/22 Brian Smither <[email protected]>

> PHP 5.4.4-TS-VC9 on Windows XP SP3 NTFS non-system drive with 18GB free.
>
> I dare not try to replicate this. As such, I cannot firmly place the blame
> on PHP.
>
> I have peppered a PHP application with a call to a function which
> appends-only to a logfile the parameters passed to it. Each pass of the
> application creates many MB of content.
>
> It is conceivable that I ran out of hard drive space.
>
> When that which what I was working on seemed to be acting very weird, I
> rebooted the computer only to see thousands of lines scroll by from Windows
> repairing the file system.
>
> I discovered logfile contents in many dozens of files. The timestamp and
> filesize of the damaged files were not changed. Only the contents replaced
> with slices of the logfile.
>
> Again, I'm not going to try to 'intentionally' replicate this, so I ask:
>
> Has PHP's interface with the NTFS file sub-system ever been reported to
> splatter a file across the contents of a drive?
>

Is the PHP-interpreter even possible to create something like this? As far
as I know PHP utilizes the common OS-syscalls to interact with the
filesystem, so it doesn't interact with the harddrive directly, but online
with the FS-driver. Did you shutdown the system cleanly, when you
recognized this behaviour? If not, it would explain, that the windows
assumes the filesystem must be repaired. I can imagine, that this "repair
process" associated the broken data with the wrong file-entries in the
fs-table, which could be an explanation for the behaviour you described.

Regards,
Sebastian


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