dynamically creating variable names

Hi, Can someone tell me if it's possible to create variable names from varaible names? I could work around this problem using some if/else statements, but I'm interested to see if there's another solution. I have 20 associative arrays all named compA, compB, compF, etc. The user supplies a string e.g. "YB"... // one of the 20 arrays $compY = array ( // Y Tyr Tyrosine "H" => 9 ,"X" => 2 ,"C" => 9 ,"N" => 1 ,"O" => 2 ,"S" => 0 ); $sequence = "YB"; $sequence = strtoupper ($sequence); for ($i = strlen($sequence)-1; $i >= 0; $i--) { // create a temp variable called comp + $i // e.g. on first iteration access the array, $compB // and on the second, access $compY } Thanks very much in advance. - Best regards, Lee Reilly