  In this article, we study the triple-collinear limit of scattering
amplitudes, focusing the discussion in processes which include at least one
photon. To deal with infrared divergences we applied dimensional regularization
(DREG) and we worked in the time-like (TL) kinematical region in order to
ensure the validity of strict-collinear factorization. Both polarized and
unpolarized splitting functions were obtained using independent codes, which
allowed to implement a first cross-check among them. The divergent structure of
all the triple-collinear splittings was compared with the Catani's formula, and
we found a complete agreement. Moreover, in the polarized case, this comparison
imposed additional constraints in the finite part of some master integrals
(MI). The analysis of photon-started splittings led to very compact
expressions, because of gauge invariance. These contributions were identified
with the Abelian terms of the remaining splitting functions, which constitutes
another cross-check of the results.
