When it comes to implementing web services platforms like JEE and .Net get a lot of attention and perhaps rightly so because the are the basis for many enterprise solutions today, however, PHP which is used extensively around the web is also an idea language for consuming and often implementing web services. Here are some online resources that can help with implementing web services and web service clients with PHP:
Documentation provided in the with the PHP documentation for various web services realted classes:
http://php.net/manual/en/refs.webservice.php
Here is an example of a PHP SOAP client accessing and being authenticatied by a remote web service:
http://www.php.net/manual/en/book.soap.php#96033
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