CURLOPT_KRBLEVEL
Constant  • Added in PHP 5.5  
CURLOPT_KRBLEVEL is one of the accepted parameters for curl_setopt parameter #2.
CURLOPT_KRBLEVEL — Set the kerberos security level for FTP and also enables kerberos awareness.
This should be set to one of the following strings:
.
If the string is set but does not match one of these,
private is used.
Setting this option to null will disable kerberos support for FTP.
Defaults to null.
Available as of cURL 7.16.4.
CURLOPT_KRBLEVEL = 10063;Changes to the CURLOPT_KRBLEVEL Constant 
PHP 5.5
- Constant added
CURLOPT_KRBLEVEL Constant Availability
CURLOPT_KRBLEVEL Constant Availability| PHP Version | Availability | 
|---|---|
| PHP 8.6Future Release | Yes | 
| PHP 8.5Upcoming Release | Yes | 
| PHP 8.4Supported (Latest) | Yes | 
| PHP 8.3Supported | Yes | 
| PHP 8.2Security-Fixes Only | Yes | 
| PHP 8.1Security-Fixes Only | Yes | 
| PHP 8.0Unsupported | Yes | 
| PHP 7.4Unsupported | Yes | 
| PHP 7.3Unsupported | Yes | 
| PHP 7.2Unsupported | Yes | 
| PHP 7.1Unsupported | Yes | 
| PHP 7.0Unsupported | Yes | 
| PHP 5.6Unsupported | Yes | 
| PHP 5.5Unsupported | Yes | 
| PHP 5.4Unsupported | No | 
| PHP 5.3Unsupported | No |