(PHP 5 >= 5.5.0, PHP 7)
imageaffinematrixconcat — Concat two matrices (as in doing many ops in one go)
$m1
   , array $m2
   )
This function is currently not documented; only its argument list is available.
m1Array with keys 0 to 5.
m2Array with keys 0 to 5.
   Array with keys 0 to 5 and float values or FALSE on failure.