Driver Code
$ n = 12 ; $ minimal = MinimumPrimes ( $ n ) ; if ( $ minimal != -1 ) { echo ( " Minimum ▁ number ▁ of ▁ single ▁ " . " digit ▁ primes ▁ required ▁ : " ) ; echo ( $ minimal ) ; } else { echo ( " Not ▁ possible " ) ; } ? >