changing post variable names

Hi, I have a php page that accepts post values (ie; ...../page.php?var1=0&var4=5). Now there can be posted values between var(1) and var(10) and i want to check if they exist and also utilise them. Is there a way of accessing these values in a loop ie;- for($i=1;$i<=10;$i++){ // do things in here that access the vars like this $blah = $var$i; } thanks lee