为什么PHP认为此文件夹不存在? [英] Why does PHP think this folder doesn't exist?

问题描述

我在创建文件夹和写入文件夹时遇到麻烦.

I'm having trouble creating a folder and writing into it.

if(file_exists("helloFolder") || is_dir("helloFolder")){
    echo "folder already exists";
} else {
    echo "no folder, creating";
    mkdir("helloFolder", 0755);
}

即使文件夹已经存在，它也会返回"no folder, creating".然后我得到这个错误:

This returns "no folder, creating" even when the folder already exists. Then I get this error:

Warning:  mkdir() [function.mkdir]: No such file or directory in script.php on line 18

警告:file_put_contents(/filename.txt)[function.file-put-contents]:无法打开流:58行的script.php中的权限被拒绝

Warning: file_put_contents(/filename.txt) [function.file-put-contents]: failed to open stream: Permission denied in script.php on line 58

非常奇怪的是，我调用了三个单独的脚本来执行此操作，尽管一个脚本始终有效，但另外两个始终会出现此错误.我正在同步调用脚本，所以我认为没有任何重叠之处.他们之间的其他一切都一样.全部具有权限644，所有文件夹均具有权限755.

What is very strange is that I call three separate scripts that do this, and while the one always works, the other two always give this error. I'm calling the scripts synchronously, so I don't think there's any overlapping going on. Everything else is the same between them. All have permissions 644, all folders have permission 755.

推荐答案

首先，在使用FileSystem时应遵循绝对补丁，而且还存在两个小缺陷:

First of all, you should adhere to the absolute patches when working with FileSystem, and also there are two minor flaws:

• is_dir()-检查文件是否存在及其目录.因此file_exists()有点多余.

• is_dir() - Checks whether file exists and its a directory. Therefore file_exists() is kinda redundant.

如果在其他任何地方使用相同的字符串，最好将其值保存在变量中.

If you work with the same string anywhere else, it would be better to save its value in a variable.

最后，您的代码应如下所示，

And finally, your code should look like this,

$target = dirname(__FILE__) . '/hellodir';

if (is_dir($target)) {

    echo "folder already exists";

} else {

    echo "no folder, creating";
    // The 3-rd bool param includes recursion
    mkdir($target, 0777, true);
}

这将按预期工作.

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