Php openssl_encrypt aes-256-cbc不适用于超过4个json参数 案例1->$data='{“EmployeeCode”：“demo2”，“PartnerCode”：“abcd”，“FlexUser”：“false”，“Role”：“INV”}' 案例2->$data= “{”EmployeeCode“：”demo2“，”PartnerCode“：”abcd“，”FlexUser“：”false“，”Role“：”INV“，”CheckupQualifiety“： “真”}； $method=“aes-256-cbc”； $first_key=”A1HS8CUR1TY@9812"; $iv=”A1HS8CUR1TY@9812"; $secret=”A1HREW30SEC@1720"; $first_encrypted=openssl_encrypt（$data，$method，$first_key，openssl_ZERO_PADDING，$iv）；

我正在尝试使用aes-256-cbc加密上面的json字符串，但在案例2中没有得到任何输出，而在案例1中得到了正确的输出。您能帮我一下吗

case 1 -> $data = '{"EmployeeCode":"demo2","PartnerCode":"abcd","FlexUser":"false","Role":"INV"}'<br/>
case 2 -> $data = 
'{"EmployeeCode":"demo2","PartnerCode":"abcd","FlexUser":"false","Role":"INV","CheckupEligibility" : 
  "true"}';
$method = "aes-256-cbc"; 
$first_key = "A1HS8CUR1TY@9812";
$iv = "A1HS8CUR1TY@9812";
$secret = "A1HREW30SEC@1720";
$first_encrypted = openssl_encrypt($data,$method,$first_key, OPENSSL_ZERO_PADDING,$iv);