Request for Help: CodeIgniter 3 to 4 Migration

The following return types are supported

int
float
bool
string
array
callable
interfaces
object (PHP 7.2+)

You can also declare a nullable return type by putting a question mark in front of the return data type.

PHP Code:

public function foo(): ?int {
    // ...
    return bar;
} 


What did you Try? What did you Get? What did you Expect?

Joined CodeIgniter Community 2009.  ( Skype: insitfx )