We recalculate the amplitude for photon splitting in a strong magnetic
field below the pair production threshold, using the world line path
integral variant of the Bern-Kosower formalism. Numerical comparison (
using programs that we have made available for public access on the In
ternet) shows that the results of the recalculation are identical to t
he earlier calculations of Adler and later of Stoneham and to the rece
nt recalculation by Baler, Milstein, and Shaisultanov.