PHP Curl:将客户端证书发送到响应服务器(Client-Auth)

I'm trying to connect a webservice which requires client-auth. At first I tried this example: http://www.binarytides.com/use-clientside-ssl-certificate-curl-php/

This doesn't work for me, because:

 curl: (58) unable to use client certificate (no key found or wrong pass phrase?) 

After that I found an old website from 2005 - http://curl.haxx.se/mail/archive-2005-09/0138.html Here you can read that you have to split your PEM-Certificate-File into separate Key- and Cert-Files. In short: It works! Now I can do this:

 curl -d "param=12345" -G -v --key mykey.pem --cacert mycacert.pem --cert myclientcert:PASSPHRASE https://webservice.xyz

But how can I translate this command to a PHP-Script?