Quick question

Hi; I am looking at the php online manual at copy; I am using it in code to create copies of files and directories in a directory branch. It is failing to copy directories in the branch. Is that because it is not supposed to be used to copy directories? The manual does not seem to specify that it can't be used to make directories specifically (as if by copying). The situation is that a temp dir is created under a different name at the same level as the target dir. But all the directories in the tree below that can use the same name as the originals. Thank you; I have recursive code to develop a full list of included files and directories, and am looping through backward to make copies of and/or remove selected directory structures.