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PHP

Using XML-RPC with PHP
By: Lucas Marshall
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    2001-12-20


    Table of Contents:
  • Using XML-RPC with PHP
  • Compiling PHP with XML-RPC Support
  • Dissection of a XML-RPC Call
  • Dissection of a XML-RPC Response
  • Creating an XML-RPC Server
  • Creating an XML-RPC Client
  • Conclusion

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    Using XML-RPC with PHP - Dissection of a XML-RPC Call
    ( Page 3 of 7 )

    An XML-RPC call is sent from a client to a server via HTTP POST. This allows XML-RPC applications to work fairly easily behind firewalls, as port 80 is almost always open.

    Here's a sample XML-RPC call:

    POST xmlrpcexample.php HTTP/1.0 User-Agent: xmlrpc-epi-php/0.2 (PHP) Host: localhost:80 Content-Type: text/xml Content-length: 191 <?xml version='1.0' encoding="iso-8859-1" ?> <methodCall> <methodName>greeting</methodName> <params> <param> <value> <string>Lucas</string> </value> </param> </params> </methodCall>
    The first part of the request is simply a standard HTML post request. It's the data sent in the body of the request that interests us.

    The <methodCall> tags simply encapsulate the call, with all the parameters enclosed in <params> and each parameter enclosed in <param>.

    Parameters are specified enclosed in tags that tell the application what type of parameter they are. In this case, "Lucas" is a string, so it is enclosed in <string>, but there are a lot more parameter types:

    <i4> or <int>
    four-byte signed integer
    10
    <boolean>
    0 (false) or 1 (true)
    1
    <string>
    ASCII string
    Hello, DevShed!
    <double>
    double-precision signed 
    floating point number
    -21.2544
    <dateTime.iso8601>
    date/time
    20011219T12:05:26
    <base64>
    base64-encoded binary
    eW91IGNhbid0IHJlYWQgdGhpcyE=


    In addition to the basic types, there are also <struct>s and <array>s, <struct>s containing any number of <member>s that consist of <name>s and <value>s (specified in the same manner as <param>s):

    <struct> <member> <name>name</name> <value> <string>Lucas Marshall</string> </value> </member> <member> <name>age</name> <value> <i4>20</i4> </value> </member> </struct>
    and arrays merely containing any number of <value>s:

    <array> <value><i4>10</i4></value> <value><i4>20</i4></value> <value><i4>30</i4></value> </array>


     
     
    >>> More PHP Articles          >>> More By Lucas Marshall
     

       

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