Illegal string offset - I'm feeling dumb today

Okay - so, I'm trying to rewrite some stuff, and happen upon an error that I don't really understand why is showing - I'm doing something wrong, of course, but today I don't think my brain is working as it should.

Okay, this is a var_dump of $_POST:

array(5) {
["userid"]=>
string(1) "1"
["nkid"]=>
array(2) {
[1]=>
string(1) "1"
["new"]=>
string(3) "new"
}
["nk_name"]=>
array(2) {
[1]=>
string(9) "Testadmin"
["new"]=>
string(19) "Admin Senior Senior"
}
["nk_phone"]=>
array(2) {
[1]=>...
Code (markup):
Illegal string offset - I'm feeling dumb today

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