stat()和安培运算符

该代码使用位操作确保文件的权限不高于666。 要分解它:

// Retrieves the file details, including current file permissions.
$stat = stat( dirname( $new_file )); 

// The file permissions are and-ed with the octal value 0000666 to make
// sure that the file mode is no higher than 666. In other words, it locks
// the file down, making sure that current permissions are no higher than 666,
// or owner, group and world read/write.
$perms = $stat['mode'] & 0000666; 

// Finally, the new permissions are set back on the file
@chmod( $new_file, $perms );

stat() 和 chmod()

0666 是unix的八进制表示法 rwxrwxrwx 权限,所以我假设 $stat['mode'] 返回文件夹的权限。然后,他们会按位使用 0666 面具检查你是否有