使用flock()检查文件是否已被锁定? [英] Check if a file is already locked using flock()?

问题描述

我有一个要写入的文件，但我需要先将其锁定(使用flock())，以防止任何其他脚本写入该文件. 所以我有:

I have a file I'm writing to, but I need to lock it first (using flock()), to prevent any other script from writing to it. So I have:

$file=fopen($file_p);

if (flock($file, LOCK_EX)) {//lock was successful
    fwrite($file,$write_contents);          
}

但是我需要检查它是否已经被锁定，以防止其他脚本写入它.

But I need to check if it's already locked, to prevent other scripts from writing to it.

我该怎么做?

推荐答案

我将检查是否无法获得文件锁，如下所示:

I would check to see if I couldn't obtain a lock on the file, like this:

if (!flock($file, LOCK_EX)) {
    throw new Exception(sprintf('Unable to obtain lock on file: %s', $file));
}

fwrite($file, $write_contents);

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