Sadly, I cannot post the code. It's odd, though.
When the code is not part of a class, and I do a print_r($_POST) everything is coming out fine, like this :
[somearray] => Array ( something => something etc...)
When it's part of a class, and I do a print_r($_POST), the array lists like this :
[somefiled] => Hi there
[somearray] => Array
I am so confused