Some questions...

[kenshn111]

I want to update my XML using PHP... but how?
-I want to update...
----<member>
Here's my XML :

<?xml version="1.0" encoding="ISO-8859-1"?>
<members>
<member>
<name>TEST</name>
</member>
</members>

Also, how to count the number of data(<member>) in the XML?

--
Sorry if I'm not clear...

[kenshn111]

I want to know if there's such thing as
-create data in XML
using PHP
like...

Name : _____________(<< text box) (for example.. Name : Maaku)
---------Submit-----------------
and when I click the submit button it will add a new data in XML

So this

<?xml version="1.0" encoding="ISO-8859-1"?>
<members>
<member>
<name>TEST</name>
</member>
</members>

Will turn into :

<?xml version="1.0" encoding="ISO-8859-1"?>
<members>
<member>
<name>Maaku</name>
</member>
<member>
<name>TEST</name>
</member>
</members>

[djr33]

There are several xml function libraries for PHP. Take a look at them and see if they'll work.
One of several options: http://www.php.net/manual/en/book.xml.php
What you are doing is probably the hard way-- why not use a database? That's the easiest/best way.