Description:
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When using mkdir() to create a directory recursively it creates directories which can not be removed with ftp. However when I create a single directory with mkdir it is removable.

Reproduce code:
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<?php

mkdir('test_dir2', 0777, FALSE);
mkdir('test_dir3', 0777, TRUE);
mkdir('test_dir4/blaat', 0777, TRUE);

?> 

Expected result:
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I expected that I could easily delete all the directories using ftp.

Actual result:
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Deleting the directories (using ftp): test_dir2 and test_dir3 worked as I expected it. 

Trying to delete blaat or test_dir4 returned an error:
[23:25:38] 550 blaat: Permission denied (or in the case of the other
directory: test_dir4: permission denied)

Someone else who tested it on his system replied:

This did the same thing on my machine. I had to be a superuser in order to delete it at the command line (which is essentially what you would need to do over FTP). I have no idea why that would happen.