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php的rename函数删文件的问题

Jun 06, 2016 pm 08:30 PM
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最近做项目时遇到个奇怪问题,php的rename函数貌似会删除数字命名的文件,具体是这样的 :
如果一个文件夹中有10个文件,1.jpg - 10.jpg ,如果运行我写的这个函数,就会删除掉除1.jpg和10.jpg以外的文件,又测试了下,貌似会根据文件数量随机删一些文件,函数如下:

<code>function getFile($dir)
{
    $dirObj = new \DirectoryIterator($dir);
    $file = [];
    $i = 1;
    foreach ($dirObj as  $v) {
        if ($v->isDot() || $v->isDir()) continue;
        if ($v->isFile()) {
            $new = $i . '.' . $v->getExtension();
            rename($dir . '/' . $v->getFilename(), $dir . '/' . $new);
            $file[] = $new;
            $i++;
        }
    }
    return $file;
}
</code>
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环境:win7,apache 2.4.9,php 5.5.12
如果不是rename的原因,那也不应该是DirectoryIterator类的原因啊,这是运行函数前

php的rename函数删文件的问题

这是运行后

php的rename函数删文件的问题

回复内容:

最近做项目时遇到个奇怪问题,php的rename函数貌似会删除数字命名的文件,具体是这样的 :
如果一个文件夹中有10个文件,1.jpg - 10.jpg ,如果运行我写的这个函数,就会删除掉除1.jpg和10.jpg以外的文件,又测试了下,貌似会根据文件数量随机删一些文件,函数如下:

<code>function getFile($dir)
{
    $dirObj = new \DirectoryIterator($dir);
    $file = [];
    $i = 1;
    foreach ($dirObj as  $v) {
        if ($v->isDot() || $v->isDir()) continue;
        if ($v->isFile()) {
            $new = $i . '.' . $v->getExtension();
            rename($dir . '/' . $v->getFilename(), $dir . '/' . $new);
            $file[] = $new;
            $i++;
        }
    }
    return $file;
}
</code>
Copy after login
Copy after login

环境:win7,apache 2.4.9,php 5.5.12
如果不是rename的原因,那也不应该是DirectoryIterator类的原因啊,这是运行函数前

php的rename函数删文件的问题

这是运行后

php的rename函数删文件的问题

你只需要跟踪一下你传递给 rename 两个参数值就知道结果了
因为这里遍历文件的时候,文件排序是
1.jpg
10.jgp
2.jpg
3.jpg
...
9.jpg
然后 rename 的时候就会变成
1.jpg -> 1.jpg
10.jpg -> 2.jpg
2.jpg -> 3.jpg
3.jpg -> 4.jpg
...
9.jpg -> 10.jpg
所以最后只剩下两个文件

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