WordPress MU

Sorry for the silly question, but i don't know a word of php.
I want to use the blog subdomain names as Flickr tags.

For example my blog names are something similar to:

http://newyork.blog.com or http://london.blog.com

i need to automatically retrieve the word "newyork" or "london", and use them as tags for each sub blog (using "substr" i presume)

can you tell me how to extract them from the bloginfo('name') in php, and creating a new string with them?

My goal is to show in every sub blog, flickr photos related to the sub blog title.
Thanx!

Explode the http host by the dot and grab the first array value.

yes, but i need a way to make it dinamical, for each sub blog.

if bloginfo('name') is london.blog.it i want to create a text string that only says "london". And then i could pass it to the flickr search.

I only need to know how in php to create a string that is equal to bloginfo('name') - ".blog.it"

The function to use is substr, but i am not able to write it alone...i can do that in asp but i'm really php ignorant :-)

Explode the http host by the dot and grab the first array value.

Let me rephrase that according to:

"Sorry for the silly question, but i don't know a word of php."

Explode the http host by the dot and grab the first array value.

Lunabyte you are very kind, but i need sintax to grab the array value.
How do you write the php code for obtaining a string "london" from bloginfo('name') that contains "london.blog.com", and so on for every city sub blog?
Thanx and sorry for my bad english

Um, I just told you how.

I didn't write the code for it, but I just told you exactly what to do and what to grab.

You don't need bloginfo anything. Nothing. Zero. Zip. Nada.