please note
the key 'friendlyname' should be 'friendly_name' in args
$args = array(
        'friendly_name'=> 'www.example.com'
);(PHP 5 >= 5.2.2, PHP 7, PHP 8)
openssl_pkcs12_export_to_file — Exports a PKCS#12 Compatible Certificate Store File
$certificate,$output_filename,$private_key,$passphrase,$options = []
   openssl_pkcs12_export_to_file() stores
   certificate into a file named by
   output_filename in a PKCS#12 file format.
  
x509See Key/Certificate parameters for a list of valid values.
output_filenamePath to the output file.
private_keyPrivate key component of PKCS#12 file. See Public/Private Key parameters for a list of valid values.
passphraseEncryption password for unlocking the PKCS#12 file.
optionsOptional array, other keys will be ignored.
| Key | Description | 
|---|---|
| "extracerts" | array of extra certificates or a single certificate to be included in the PKCS#12 file. | 
| "friendly_name" | string to be used for the supplied certificate and key | 
| Version | Description | 
|---|---|
| 8.0.0 | certificateaccepts an OpenSSLCertificate instance now;
       previously, a resource of typeOpenSSL X.509 CSRwas accepted. | 
| 8.0.0 | private_keyaccepts an OpenSSLAsymmetricKey
       or OpenSSLCertificate instance now;
       previously, a resource of typeOpenSSL keyorOpenSSL X.509was accepted. | 
please note
the key 'friendlyname' should be 'friendly_name' in args
$args = array(
        'friendly_name'=> 'www.example.com'
);[, array $args ]  can contain only: extracerts, friendly_name
extracerts - additional certificates (can be file or string)
friendly_name - "friendly name" for the certificate and private key. This name is typically displayed in list boxes by software importing the file.
based on source code version 5.2.8 and pkcs12 man page