Checking if exists...
special_code formatted: 07
special_code OK: 07
code[01] -> sprintf -> 01
code[02] -> sprintf -> 02
code[03] -> sprintf -> 03
code[04] -> sprintf -> 04
code[05] -> sprintf -> 05
code[06] -> sprintf -> 06

Final code array:
Array
(
    [0] => 01
    [1] => 02
    [2] => 03
    [3] => 04
    [4] => 05
    [5] => 06
)

open_draw_code: 01,02,03,04,05,06
special_code: 07

=== sprintf 测试 ===
sprintf('%02d', ''): '00'
sprintf('%02d', null): '00'
sprintf('%02d', 0): '00'
sprintf('%02d', 'abc'): '00'
sprintf('%02d', false): '00'
sprintf('%02d', true): '01'
sprintf('%02d', '07'): '07'
sprintf('%02d', 7): '07'