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Hip To Be Square - PHP

You may never have heard of it before - but if your job involvesexchanging data between different servers and applications, you're going tobe hearing a lot about it very soon. Find out how WDDX makes it possible tocreate and transmit platform-neutral data structures across the Web, andhow it can be combined with PHP to create a whole new generation of Webapplications (including new content syndication and financial updateservices).

  1. Data Exchange with XML, WDDX and PHP
  2. The Wonderful World Of WDDX
  3. Polly Wants A Cracker
  4. Humbert Redfinch-Northbottom The Third, I Presume?
  5. Old Friends And New
  6. Hip To Be Square
  7. The Truth Is Out There
  8. Money Talks
  9. Closing Time
By: Vikram Vaswani, (c) Melonfire
Rating: starstarstarstarstar / 4
September 13, 2001

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The wddx_packet_start(), wddx_add_vars() and wddx_packet_end() functions are used in tandem, to create a WDDX packet and add variables to it one after another. This comes in handy if you're adding values in a loop, or retrieving them from a database. Consider the following example, which creates a WDDX structure containing the squares of numbers between 1 and 10.

<? // variable prefix $prefix="square_of_"; // create packet $wp = wddx_packet_start(); // add variables to it for ($x=1; $x<=10; $x++) { // dynamically generate variable name $varname = $prefix . $x; $$varname = pow($x, 2); // add to packet wddx_add_vars($wp, "$prefix$x"); } // end and print echo wddx_packet_end($wp); ?>
In this case, I'm first starting a new WDDX packet with the wddx_packet_start() function, which returns a WDDX resource handle for further use; this handle is used for all subsequent operations.

Next, I generate the squares of all numbers between 1 and 10 using a loop, dynamically generate a variable name to hold the value, and add this variable to the packet via the wddx_add_vars() function. This function works exactly like wddx_serialize_vars() - you can specify a list of variables to be added if you like - and requires you to specify the WDDX resource handle generated in the first step.

Once the packet has been generated, the wddx_packet_end() function is used to add the closing tags to the generated WDDX packet.

Here's the output:

<wddxPacket version='1.0'><header/> <data><struct><var name='square_of_1'><number>1</number></var><var name='square_of_2'><number>4</number></var><var name='square_of_3'><number>9</number></var><var name='square_of_4'><number>16</number></var><var name='square_of_5'><number>25</number></var><var name='square_of_6'><number>36</number></var><var name='square_of_7'><number>49</number></var><var name='square_of_8'><number>64</number></var><var name='square_of_9'><number>81</number></var><var name='square_of_10'><number>100</number></var></struct></data></wddxPacket>

>>> More PHP Articles          >>> More By Vikram Vaswani, (c) Melonfire

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