Voadam
Legend
That is only max rank. 3.5 does not retroactively give you skill ranks if you took a cross class skill then later multiclass so it is now a class skill. There is also the x4 at first level. When you spend your skill points in 3.5 matters.I think you got that wrong. In 3.5 if a skill is on class skill list for any of classes of your multi class build, it's class skill for your character. So you add up all your skill points for all the levels, mark all class skills for all classes, and max rank is you character level + 3. What PF did is streamlined it in a sense that max rank=character level, class skills get +3 bonus, non class skills don't get bonuses, but both class and cross class skills cost same amount of points per rank. So no, in PF, your class (or classes) determine what skills get class skill bonus.
It's been over a decade when i last played, so i checked SRD for 3.5 on multiclass characters.
A sneaky tough guy type taking a level of fighter then a level of rogue is very different on skills than a sneaky tough guy type who took a level of rogue then a level of fighter. In Pathfinder they are the same for their skills though.
Each skill point you spend on a class skill gets you 1 rank in that skill. Class skills are the skills found on your character’s class skill list. Each skill point you spend on a cross-class skill gets your character 1/2 rank in that skill. Cross-class skills are skills not found on your character’s class skill list. (Half ranks do not improve your skill check, but two 1/2 ranks make 1 rank.) You can’t save skill points to spend later.
The maximum rank in a class skill is the character’s level + 3. If it’s a cross-class skill, the maximum rank is half of that number (do not round up or down).
Regardless of whether a skill is purchased as a class skill or a cross-class skill, if it is a class skill for any of your classes, your maximum rank equals your total character level + 3.