Nucleotide Fun

<?php

$DNA = " does not contain U."; $RNA = " contains U."; $seq = $_GET['seq'];

for($i=0; $i<strlen($seq); $i++) { if($seq[$i] == 'U' || $seq[$i] == 'u') { echo "The input sequence is RNA because RNA" . $RNA . "\n"; break; }

else if($i == strlen($seq)-1) { echo "The input sequence is DNA because DNA" . $DNA . "\n"; }

}

?>