string(2) "ok"
string(2) "ok"
string(2) "ok"
string(2) "ok"
string(2) "ok"
string(2) "ok"
string(2) "ok"
string(2) "ok"
string(2) "ok"
NULL
string(2) "ok"
string(2) "ok"
---
string(2) "ok"
string(2) "ok"
string(2) "ok"
string(2) "ok"
string(2) "ok"
string(2) "ok"
string(2) "ok"
string(2) "ok"
string(2) "ok"
NULL
string(2) "ok"
string(2) "ok"
---