[php chmod and ftp problem]

im using mkdir and chmod to create dir, copy files into the created dir and to chmod it (anything but 777).. like:

[code]    if(!is_dir("$ausername")) {
        mkdir("$ausername", 0755);
        @chmod("$ausername", 0755);
        copy("stu_index.html", "$ausername/index.html");
        @chmod("$ausername/index.html", 0755);
    }[/code]


*the problem is i cant add files via ftp to the created folder or even delete it..

[code]    if(!is_dir("$ausername")) {
        mkdir("$ausername", 0777);
        @chmod("$ausername", 0777);
        copy("stu_index.html", "$ausername/index.html");
        @chmod("$ausername/index.html", 0777);
    }[/code]


*only when i use php to mkdir and chmod it to 777, then i am able to add files and or del the folder via ftp..

i wonder how can i not chmod the file and folder 777 yet able to edit things via ftp ? im using a shared unix host..

thanks in advance!

[Question on fopen, fwrite..]

well im using flash and display the data from the xml

anyway thanks for the pointer

[Question on fopen, fwrite..]

i have a php form (edit_info.php only for logged-in members) when submitted,

1.update mysql database (table:user_info)
2.opens a single xml file (dummy.xml) and re-writes the whole structure whenever they update their info..

That particular xml file(dummy.xml) contains all the information from a table(user_info) from the database.

my question is what if there are two or more members updating their info at the same time (in-directly attempting to update the dummy.xml file at the same time) would that be a problem? like one of the member didnt get their info updated on the xml ?

do let me know if you need to look at the codes :)