The 22-year-old joined the League Two side at the start of the season after impressing during a trial spell.
His previous terms were due to expire before the end of the month, but the Daggers have now tied him down to a fresh contract.
Porter has scored two goals in 22 games for Dagenham so far this season.
Restore Data
| Team | P | W | D | L | F | A | GD | PTS | |
| 1 | Barnet | 28 | 17 | 6 | 5 | 57 | 30 | 27 | 57 |
| 2 | Forest Green RoversForest Green | 28 | 15 | 11 | 2 | 46 | 22 | 24 | 56 |
| 3 | York City | 27 | 16 | 6 | 5 | 52 | 25 | 27 | 54 |
| 4 | Gateshead | 28 | 14 | 7 | 7 | 51 | 36 | 15 | 49 |
| 5 | Oldham AthleticOldham | 26 | 12 | 9 | 5 | 43 | 29 | 14 | 45 |
| 6 | Rochdale | 24 | 13 | 3 | 8 | 38 | 21 | 17 | 42 |
| 7 | AltrinchamAltrincham | 27 | 11 | 9 | 7 | 44 | 32 | 12 | 42 |
| 8 | Halifax TownHalifax | 26 | 11 | 9 | 6 | 31 | 24 | 7 | 42 |
| 9 | Solihull MoorsSolihull | 28 | 12 | 5 | 11 | 45 | 40 | 5 | 41 |
| 10 | Sutton UnitedSutton | 28 | 11 | 8 | 9 | 39 | 36 | 3 | 41 |
| 11 | Eastleigh | 28 | 9 | 11 | 8 | 37 | 36 | 1 | 38 |
| 12 | Hartlepool UnitedHartlepool | 27 | 9 | 11 | 7 | 33 | 32 | 1 | 38 |
| 13 | Yeovil TownYeovil | 29 | 10 | 8 | 11 | 33 | 35 | -2 | 38 |
| 14 | Southend UnitedSouthend | 27 | 9 | 9 | 9 | 31 | 30 | 1 | 36 |
| 15 | Tamworth | 26 | 9 | 7 | 10 | 31 | 43 | -12 | 34 |
| 16 | Dagenham & RedbridgeDag & Red | 26 | 8 | 8 | 10 | 40 | 36 | 4 | 32 |
| 17 | Woking | 28 | 7 | 10 | 11 | 29 | 39 | -10 | 31 |
| 18 | Aldershot TownAldershot | 28 | 6 | 12 | 10 | 42 | 48 | -6 | 30 |
| 19 | Braintree TownBraintree | 28 | 8 | 6 | 14 | 27 | 38 | -11 | 30 |
| 20 | Maidenhead UnitedMaidenhead | 28 | 7 | 5 | 16 | 35 | 57 | -22 | 26 |
| 21 | WealdstoneWealdstone | 26 | 5 | 10 | 11 | 31 | 40 | -9 | 25 |
| 22 | Fylde | 26 | 7 | 4 | 15 | 32 | 54 | -22 | 25 |
| 23 | Boston UnitedBoston | 26 | 4 | 7 | 15 | 24 | 44 | -20 | 19 |
| 24 | Ebbsfleet | 29 | 1 | 9 | 19 | 21 | 65 | -44 | 12 |
| > National League Full Table | |||||||||
