(PHP 5 >= 5.2.2, PHP 7)
openssl_pkcs12_export — Exports a PKCS#12 Compatible Certificate Store File to variable
openssl_pkcs12_export ( mixed $x509 , string &$out , mixed $priv_key , string $pass [, array $args ] ) : bool
 openssl_pkcs12_export() stores x509 into a string named by out in a PKCS#12 file format. 
x509
See Key/Certificate parameters for a list of valid values.
out
On success, this will hold the PKCS#12.
priv_key
Private key component of PKCS#12 file. See Public/Private Key parameters for a list of valid values.
pass
Encryption password for unlocking the PKCS#12 file.
args
Optional 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. | 
"friendlyname" |  string to be used for the supplied certificate and key | 
 Returns true on success or false on failure. 
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    https://www.php.net/manual/en/function.openssl-pkcs12-export.php