On the PHP Web Services blog today, Sami asks "what's missing from PHP's SOAP extension" that needs to be added or corrected.
PHP SOAP extension is good to get started, to play around with. However, it falls much short in meeting the enterprise demands in the SOA era.
He talks about things missing (like binary file features and lots of security features). He also notes something that most PHP developers love about the extension - the WSDL parsing that makes it so easy to simply call a remote service without having to go through the pain of hacking through it yourself.