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<?php$res = [];$openSSL = openssl_pkcs12_read($pkcs12, $res, $cert_password);if(!$openSSL) { throw new ClientException("Error: ".openssl_error_string());}// this is the CER FILEfile_put_contents('CERT.cer', $res['pkey'].$res['cert'].implode('', $res['extracerts']));// this is the PEM FILE$cert = $res['cert'].implode('', $res['extracerts']);file_put_contents('KEY.pem', $cert);