测试文件是否被锁定 [英] Test if file is locked

问题描述

在PHP中，如何测试文件是否已经被 flock ?例如，如果另一个正在运行的脚本调用了以下内容:

In PHP, how can I test if a file has already been locked with flock? For example, if another running script has called the following:

$fp = fopen('thefile.txt', 'w');
flock($fp, LOCK_EX);

推荐答案

if (!flock($fp, LOCK_EX|LOCK_NB, $wouldblock)) {
    if ($wouldblock) {
        // another process holds the lock
    }
    else {
        // couldn't lock for another reason, e.g. no such file
    }
}
else {
    // lock obtained
}

如文档中所述，请使用LOCK_NB进行进行非阻塞性尝试以获取该锁，并在失败时检查$wouldblock参数以查看是否有其他东西持有该锁.

As described in the docs, use LOCK_NB to make a non-blocking attempt to obtain the lock, and on failure check the $wouldblock argument to see if something else holds the lock.

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