ChatGPT php function

Hi
Need php function "MyGpt" (p1, p2, p3) return varchar "
Parameters :
p1 : QuestionToGpt : varchar (256)
p2 : NbIteration : integer
p3 : emailToSendAnswer

i : integer
globalAnswer : varchar (512)
....
While i < NbIteration
{
Send QuestionToGpt using openAPI API.
retrieve answer
globalAnswer=concat (globalAnswer, answer)
QuestionToGpt ="Continue"
}
Return globalAnswer

Explain me how to test the function.