Questions about PHP recursive functions

Some questions about PHP recursive functions are not mentioned, so I will comment my questions directly in the code.

 
 
 
Reply to discussion (solution)
Digui (++ $ I );
Change
$ I = digui (++ $ I );

The digui function has a return value. you have to have someone to catch it.
 
 
Key: how to make him return 3
The general meaning of recursion is clear.
 
Digui (++ $ I );
Change
$ I = digui (++ $ I );

The digui function has a return value. you have to have someone to catch it.

Check hundreds of posts. it is better to ask and solve the problem.
 
The function should be written in this way.
Function digui ($ I = 0) {if ($ I <3) {echo $ I; return digui (++ $ I);} return $ I ;}
 
 
Ox cross