The document discusses PHP and web services. It provides an overview of PHP as a scripting language, how it is used, and who uses it. It then covers different web service standards - SOAP, REST, and JSON - and how they can be implemented using PHP. SOAP uses XML, REST can use either XML or JSON, and JSON is best for client-side applications. The document concludes that PHP easily supports various standards but REST requires more coding than SOAP, and recommends JSON for client applications.