Driver Code
$ n = 642 ; echo $ n , " ▁ : ▁ " ; if ( isSandwitched ( $ n ) ) echo " Yes STRNEWLINE " ; else echo " No STRNEWLINE " ; $ n = 9 ; echo $ n , " ▁ : ▁ " ; if ( isSandwitched ( $ n ) ) echo " Yes STRNEWLINE " ; else echo " No STRNEWLINE " ; ? >