DSolve[2 + 2*a + 6*a*phi[x]*y[x]^2 + a*y[x]^3*Derivative[1][phi][x] + Derivative[1][y][x] + ((1 + 2*a)*y[x]*Derivative[2][phi][x])/Derivative[1][phi][x] == 0,y[x],x]