Driver Code
$ arr = array ( -10 , -3 , 5 , 6 , -20 ) ; $ n = sizeof ( $ arr ) ; $ max = maxProduct ( $ arr , $ n ) ; if ( $ max == -1 ) echo " No ▁ Quadruple ▁ Exists " ; else echo " Maximum ▁ product ▁ is ▁ " . $ max ;