PayPal发送多个项目

亲爱的朋友们，这是我在PayPal上发送多个项目的数组。

Array
(
    [item_name1] => this is the testing job
    [item_number1] => 2433
    [amount1] => 40
    [item_name2] => testing job 2
    [item_number2] => 2435
    [amount2] => 40
    [item_name3] => testing job 3
    [item_number3] => 2437
    [amount3] => 40
    [item_name4] => testing job 4
    [item_number4] => 2439
    [amount4] => 40
    [item_name5] => testing job 5
    [item_number5] => 2441
    [amount5] => 40
    [item_name6] => testing job 6
    [item_number6] => 2443
    [amount6] => 40
    [business] => mysend@mydoma.com
    [currency_code] => USD
    [cbt] => Continue to testing code
    [return] => http://mydomain.com/order/4456/?_wpnonce=de449cd303
    [cancel_return] => http://mydomain.com/order/4456/?cancel=1
    [noshipping] => 1
    [no_note] => 1
    [rm] => 0
    [charset] => utf-8
    [cmd] => _xclick
)

这个数组不工作。 然后我在谷歌上搜索，我发现item_name_1像数组

Array
(
    [item_name_1] => this is the testing job
    [item_number_1] => 2433
    [amount_1] => 40
    [item_name_2] => testing job 2
    [item_number_2] => 2435
    [amount_2] => 40
    [item_name_3] => testing job 3
    [item_number_3] => 2437
    [amount_3] => 40
    [item_name_4] => testing job 4
    [item_number_4] => 2439
    [amount_4] => 40
    [item_name_5] => testing job 5
    [item_number_5] => 2441
    [amount_5] => 40
    [item_name_6] => testing job 6
    [item_number_6] => 2443
    [amount_6] => 40
    [business] => mysend@mydoma.com
    [currency_code] => USD
    [cbt] => Continue to testing code
    [return] => http://mydomain.com/order/4456/?_wpnonce=de449cd303
    [cancel_return] => http://mydomain.com/order/4456/?cancel=1
    [noshipping] => 1
    [no_note] => 1
    [rm] => 0
    [charset] => utf-8
    [cmd] => _xclick
)

但是这个数组我PayPal传递了，但PayPal没有显示任何项目，请帮忙。

谢谢。