Nesting Funtions PHP

[RobinVossen]

This is how my script looks: (Pseudo)

[Main File]
include ('1');
function_defined_in_1
[/Main File]
[File 1]
include ('2');
function_defined_in_2
[File 1]
[File 2]
Do Something
[File 2]

But he doesnt work. I keep getting: "
Fatal error: Call to undefined function init_Encypt() in FILE1 on line 58"

So I thought I might do something wrong with File names.
in file 1 I do:
$td = init_Encrypt($key);
in file 2 I do:
function init_Encrypt($key)
{
//Dostuff
return $td;
}

Whats wrong?