PHP：clearstatcache() 不起作用
我的工作流程非常简单：
- 我删除一个
- 名为
clearstatcache()的 - 文件我保存一个
- 名为
clearstatcache()的
新文件不过，最后， is_file( ) 返回 false 一段时间，然后决定在 10 秒后刷新时返回 true 。
看起来像是缓存问题，不是吗？
这是我的一段代码：
// step 1
$path = 'file_to_delete.jpg';
unlink($path);
// is_file($path) returns false here -- normal behavior
// step 2
clearstatcache();
// step 3 -- some stuff going on on an uploaded image, that leads to:
imagejpeg($imagetosave, $path, 80);
// step 4
clearstatcache();
// is_file() returns false, i have to wait a couple of seconds before it starts returning true
谢谢您的帮助！
编辑：
鉴于我得到的所有答案，问题似乎并非来自clearstatcache()。
但我应该补充一点，当我覆盖文件时（因此其现有状态不会改变），is_file() 返回良好的结果。但当其现有状态实际发生变化时，问题就会发生。如果错误不是来自 clearstatcache()，那会很奇怪，对吧？ （或者确实与此缓存相关的东西）
My workflow is pretty simple:
- I delete a file
- I call
clearstatcache() - I save a new file
- I call
clearstatcache()
Still, at the end, is_file() returns false for a while before deciding to return true when i refresh 10sec later for example.
It looks like a cache problem, doesn't it?
Here's a piece of my code:
// step 1
$path = 'file_to_delete.jpg';
unlink($path);
// is_file($path) returns false here -- normal behavior
// step 2
clearstatcache();
// step 3 -- some stuff going on on an uploaded image, that leads to:
imagejpeg($imagetosave, $path, 80);
// step 4
clearstatcache();
// is_file() returns false, i have to wait a couple of seconds before it starts returning true
Thank you for your help!
EDIT:
Given all the answers i had, the problem doesn't seem to come from clearstatcache().
But should i add, when i overwrite the file (thus its existing status doesn't change), is_file() returns the good result. but when its existing status actually changes, the problem happens. It would be weird if the error didn't come from clearstatcache(), right? (or something related to this cache indeed)
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我同意@hakre，检查创建/删除的结果。
这不是快速而肮脏的，甚至 Rasmus 本人推荐它：
如果你真的坚持使用
clearstatcache()，我想到的唯一一件事（除了写入缓存）是，你可能有一个非常巨大的上传文件夹，其中包含数千个文件。在一个文件夹中包含很多很多文件肯定会减慢重新声明的速度。
如果是这样，请尝试减少文件数量以获得统计性能，例如通过创建多个文件夹，为上传文件名的每个初始字符创建一个文件夹，例如
upload/a/、upload/ b/等I agree with @hakre, check the result of the create/delete.
It's not quick-and-dirty, even Rasmus himself recommends it:
If you really insist on using
clearstatcache(), the only thing (other than write caching) coming to my mind is, that you mave have a very huge upload folder, containing thousands of files.Having many, many files in a single folder will definitely slow down re-stating.
If so, try to reduce the number of files to gain stat performance, e.g. by creating multiple folders, one folder for each initial char of your upload filenames, like
upload/a/,upload/b/, etc.