in reply to
Matching first Letters of two words
Yes it is.
Please have a look at substr and Equality Operators.
Since the requirement mentioned ignoring case, pointers to lc and uc might also be helpful given your approach.
The same name on every site (unless it is taken already)
A different name for every site
The same name for sites I don't care about, but different names on sites I do care about
Different names for sites I don't care about, but the same name on sites I do care about
The anonymous account
Someone else's username
Root, after hacking into the site
Results (240 votes),