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Zend_Http_Client provides an easy interface for preforming Hyper-Text Transfer Protocol (HTTP) requests. Zend_Http_Client supports most simple features expected from an HTTP client, as well as some more complex features such as HTTP authentication and file uploads.

Zend_Json provides convenience methods for serializing native PHP to JSON and decoding JSON to native PHP.
JSON, JavaScript Object Notation, can be used for data interchange between JavaScript and other languages. Since JSON can be directly evaluated by JavaScript, it is a more efficient and lightweight format than XML for exchanging data with JavaScript clients.

Zend_Locale is the Frameworks answer to the question, "How can the same application be used around the whole world?" Most people will say, "That's easy. Let's translate all our output to several languages." However, using simple translation tables to map phrases from one language to another is not sufficient. Different regions will have different conventions for first names, surnames, salutory titles, formatting of numbers, dates, times, currencies, etc.

Zend_Log is a general purpose logging class. Zend_Log is a static class that can not be instantiated directly. It holds an array of instances of Zend_Log, one for each log used by the application. Each logger instance uses an adapter that implements Zend_Log_Adapter_Interface.

Zend_Mail provides generalized functionality to compose and send both text and MIME-compliant multipart e-mail messages. Mail can be sent with Zend_Mail via the php built-in mail() function or via direct SMTP connection.

Zend_Measure provides a generic and very easy way for working with measurements.
Using Zend_Measure, you can convert measurements into different units of the same type. They can be added, subtracted and compared against each other. From a given input made in the user's native language, the unit of measurement can be automatically extracted.
Of course a great number of completely different units of measurement is being supported. Most of these units are of a physical nature, but there are also special measurements used, in numerics or other areas, that are only partly physical - or not at all.
The following quickstart tutorial shows how units of measurement can be automatically converted.

Zend_Mime is a support class for handling multipart MIME messages. It is used by Zend_Mail and Zend_Mime_Message and may be used by applications requiring MIME support.

Zend_Pdf module is a PDF (Portable Document Format) manipulation engine written entirely in PHP 5. It can load existing documents, create new, modify and save modified documents. Thus it can help any PHP-driven application dynamically prepare documents in a PDF by modifying existing template or generating document from a scratch.

Zend_Search_Lucene is a general purpose text search engine written entirely in PHP 5. Since it stores its index on the filesystem and does not require a database server, it can add search capabilities to almost any PHP-driven website. Zend_Search_Lucene supports the following features: Ranked searching - best results returned first, Many powerful query types: phrase queries, wildcard queries, proximity queries, range queries and more, Search by specific field (e.g., title, author, contents), Zend_Search_Lucene was derived from the Apache Lucene project.

From its home page, XML-RPC is described as a "...remote procedure calling using HTTP as the transport and XML as the encoding. XML-RPC is designed to be as simple as possible, while allowing complex data structures to be transmitted, processed and returned."
The Zend Framework provides support for both consuming remote XML-RPC services and building new XML-RPC servers.