Hi guys. Might be an easy question for you guys. can't find it on google.

I am trying to concatenate two variables name;

$i=0;
 for ($i=0;$i<5;$i++){
   if($array[$i]>0){

   $test.$i=//do something
   }else{
  $test.$i=//do something
  }
}

//echo $test0 gives me nothing.
//echo $test1 gives me nothing.

I know I can't use $test.$i but don't know how to do this.Any helps? Thanks!