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Editorial Team
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Asked: 2026-06-06T18:36:49+00:00

I have a PHP script that opens an XML document, gets the DOM and

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I have a PHP script that opens an XML document, gets the DOM and modifies it, and then overwrites the original document.
As I understand it, PHP calls are made asynchronously, so multiple users could be accessing the document at the same time and then saving to it with the second save overwriting the first.
I need this not to be the case. I can’t use flock() since that only applies to the current process, so how can I accomplish this?

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1 Answer

  1. Editorial Team

    Actually, flock() doesn’t only apply to the current process:

    http://php.net/manual/en/function.flock.php

    It does use the local filesystem, though, which may become an issue if you’re using load-balanced webservers. Also, in order for flock to work you have to make sure that any other processes which may be “competing” for the file are also using flock, otherwise the processes will “step” on each other.

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