How to use the certificate from the NSS database in CURL from the PHP file?

Question

I have a pfx certificate which dosent work with curl command. Than I am try to import this file to NSS DB and after this curl command from terminal will work, but i can’t figure out how to add this certificate to curl in php file.

import certificate to NSS DB

pk12util -i key.pfx -d sql:/etc/pki/nssdb
certutil -L -d sql:/etc/pki/nssdb

"pfx-key" is the cert name in NSS DB "password" is the password when importing certificate to NSS DB

curl --cert pfx-key:password --location --request POST 'https://example.com' --header 'Content-Type: application/json' --data '{}'

• this command works

but how make it works from code?

curl

        $ch = curl_init();
        curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
        curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, false);
        curl_setopt($ch, CURLOPT_HTTPHEADER, ['Content-type: application/json']);

        curl_setopt($ch, CURLOPT_URL, 'https://example.com');

        curl_setopt($ch, CURLOPT_SSLCERT, 'pfx-key');
        curl_setopt($ch, CURLOPT_SSLKEY, 'pfx-key');
        curl_setopt($ch, CURLOPT_KEYPASSWD, 'password');

        curl_setopt($ch, CURLOPT_POST, 1);
        curl_setopt($ch, CURLOPT_POSTFIELDS, '{}');
        curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);


        if (! $result = curl_exec($ch)) {
           var_dump(curl_error($ch));
        }

        curl_close($ch);