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Caution This chapter will not detail any type of security that you may need or want to implement. Publicly implemented Web services can be dangerous when not properly protected because you are possibly allowing anonymous users to execute code on your server. You must take the same care when building a Web application as when implementing an XML-RPC server. This includes, at a minimum, checking data inputs and possibly performing data encryption.

XML-RPC stands for XML-based Remote Procedure Call. A procedure call, if you are not familiar with the term, is simply a function call in terms of PHP It is some code that you can call, . passing in parameters that the block of code can use, and from which you can possibly receive a return value. A remote procedure call is effectively the same except the code being called exists in and is executed by a different application and possibly by a different machine. For a remote procedure call to take place, the call to the function, as well as any parameters needed by the remote function and any results, must be exchanged between the two systems. This of course cannot occur in the usual manner. Instead, everything must be marshaled. Marshaling involves taking some data and converting it to a common format, which then can be sent somewhere (including over a network), received by a remote system, and then converted into data understandable by the receiver. If you read the previous chapter, this should sound familiar. WDDX takes native PHP data, converts it to a common XML structure that could be passed to some other system, and converts it into the other system s native data types. XML-RPC performs similar marshaling to what WDDX does; it converts the native data types into an XML structure, but XML-RPC goes further than WDDX and is why it s considered to be a true Web service. It not only specifies the format for the XML message, but it also

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Figure 8-1. Configuring the User Story column For the Item Status column, enter the choices as Pending, In Progress, and Complete. Unselect the Allow blank values check box and specify the default value of Pending, as shown in Figure 8-2.

defines how the message is transported. An HTTP POST request is the mechanism used as the transport in XML-RPC. Being a complete specification (http://www.xmlrpc.com/spec), as well as defining ways to call remote procedures, XML-RPC is a much more well-known and more commonly used technology than WDDX. Now, don t get me wrong I still think WDDX can be useful, especially since it does not define a specific transport, leaving the possibilities endless.

A <h:column> tag represents a column in the table. Here, it represents the "product id" column. The rendering order is shown below.

Structure within XML-RPC depends upon the direction of the data. Though the two share many aspects, a request takes a different form than a response. Not only does each have its own XML structure, but also each requires specific information in the HTTP headers. The following sections will cover each of these aspects and provide examples of the structure used. Before getting into any specific area, it is first important to know and understand some of the common XML elements shared between the request and the response.

Parameters passed to a function and return values are all pieces of data that have specific data types. Not only is it important that the value for these is passed, but the value s corresponding data type must be kept intact. PHP is a loosely typed language, so, for instance, you can add a string to a numeric, which would result in a numeric: $float_as_string = "1.1"; var_dump($float_as_string); $newval = 1 + $float_as_string; var_dump($newval); The output confirms that $float_as_string is actually a string and the resulting $newval is a float with the value 2.1: string(3) "1.1" float(2.1) It does not always work this way with other languages. Try doing something similar in C, for example. The resulting value would not be anything close to what you would expect in PHP . When passing values between systems, XML-RPC wraps each value within a value element. The content of this element is a single element identifying the data type and containing the data to be passed. For example, the following represents 1.1 in its serialized format: <value> <double>1.100000</double> </value> Most languages share many of the common data types, but this is not always the case. Marshaling the data creates a common format that allows a different system to interpret data into its own native types. The following sections will break down the common XML-RPC types and how they relate to the data types in PHP .

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