Online PHP editor | refs for ecA5I

<?php $a = $_POST['a'] = '6898557993159892'; $b= $_POST['b'] = '222.0'; echo $a."\n"; echo $b."\n"; echo (!is_numeric(($a * $b) . '')) ? "yes right way \n":"not number...\n"; echo (($a * $b) != INF) ? "YES infinite.. \n":"NOt inf ... \n"; if(!is_numeric (($a * $b) . '') && (($a * $b) != INF)) { echo "good\n"; }else{echo "WRONG...\n";}