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WDDX Funktionen

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WDDX Funktionen
Jimmy Wimenta
16-Jul-2004 02:53
PHP's WDDX is useful only for exchanging data between PHP applications, but definetly not for exchanging data between different languages (which actually defeats the purpose of WDDX).

For example:

$hash1 = array ("2" => "Two", "4" => "Four", "5" => "Five");
$hash2 = array ("0" => "Zero", "1" => "One", "2" => "Two");

$hash1 will be serialized as hash, but
$hash2 will be serialized as array/list, because the key happen to be a sequence starting from 0.

Unless the library provide a way for users to specify the type, it can never be used for cross-platform data exchange.
Q1tum at hotmail dot com
21-Nov-2003 02:08
To insert arrays into a wddx variable here is a fine way to do it:

<?php

$sql = 'SELECT * FROM example';
$query = mysql_query($sql, $db) or die(mysql_error());

while($result = mysql_fetch_array($query)) {
    $id[] = $result[ 'id'];
    $name[] = $result['name'];
    $description[] = $result[$prefix . 'description'];
}

mysql_free_result($query);

wddx_add_vars($packet_id, "id");
wddx_add_vars($packet_id, "name");
wddx_add_vars($packet_id, "description");

$wddxSerializeValue = wddx_packet_end($packet_id);

?>
12-Sep-2003 04:29
wddx isn't 100% perl compatible .. I have an wddx file infront of me and it only works with php so better don't use it
pointsystems.com, sbarnum
04-Sep-2002 07:11
a good FAQ on WDDX can be found here:
http://www.macromedia.com/v1/handlers/index.cfm?id=5622&method=full
bradburn at kiwi dot de
30-Jul-2002 04:02
With ref to the above comment about typing, I have found that -- oddly enough -- PHP's WDDX supports the following WDDX types: null, boolean (true/false), number and string, *but* not date-time.

as an example, use the following values in an array that you then serialize:

$number = 5,
$null = NULL,
$bool = true,
$string = 'this is a string'.

they will all serialize correctly, e.g. the third entry comes out as:

<var name='bool'><boolean value='true'/></var>

i have tried with the 'official' format for WDDX 'datetime', e.g. '1998-9-15T09:05:32+4:0' (from the DTD @ http://www.openwddx.org/downloads/dtd/wddx_dtd_10.txt)  but have only succeeded in getting this encoded as a 'string' type.

if anyone else has any more information on this, it would be welcome. i would like to store the variables in 'appropriate' fields in a database, and the fact that only datetime is not supported is slightly irritating -- otherwise it would be a very useful function.
philip at thepr()jects dot ()rg
17-Nov-2000 10:32
Tutorial here :

XML and PHP. Part 1: Using the WDDX functions
http://www.phpbuilder.net/columns/jesus20000402.php3
djm at web dot us dot uu dot net
02-Mar-2000 12:50
Here's a rewrite of the deserializing Perl code that uses variable names consistently with the serializing example.  Sorry for any confusion....
<PRE>
#!/usr/bin/perl

use WDDX;

open(FP, "<cities.wddx");
undef $/;                       # Slurp the whole file.
$packet = <FP>;
close(FP);

$wddx = new WDDX;
$packet_id = $wddx->deserialize($packet);
$value = $packet_id->as_hashref();

print "pi is:<br>" . $value->{"pi"} . "<p>\n";
print "cities is:<br>\n";
$key = 0;
foreach $val (@{$value->{"cities"}}) {
    print "$key => $val<br>\n";
    $key++;
}
</PRE>
djm at web dot us dot uu dot net
02-Mar-2000 12:36
I think it would be helpful for passing data between languages to show a direct translation of the above examples into Perl, using WDDX.pm 1.00 from CPAN.  It took me awhile to figure out.  To serialize:
<PRE>
#!/usr/bin/perl

use WDDX;

$wddx = new WDDX;
$packet_id = $wddx->struct({});

$pi = 3.1415926;
$packet_id->set("pi" => $wddx->number($pi));

# Suppose @cities came from database
@cities = ("Austin", "Novato", "Seattle");
$packet_id->set("cities" => $wddx->array([map $wddx->string($_), @cities]));

$packet = $wddx->serialize($packet_id);

open(FP, ">cities.wddx");
print FP $packet;
close(FP);
</PRE>
<P>
To deserialize:
<PRE>
#!/usr/bin/perl

use WDDX;

open(FP, "<cities.wddx");
undef $/;                       # Slurp the whole file.
$packet = <FP>;
close(FP);

$packet_id = new WDDX;
$wddx_obj = $packet_id->deserialize($packet);
$value = $wddx_obj->as_hashref();

print "pi is:<br>" . $value->{"pi"} . "<p>\n";
print "cities is:<br>\n";
$key = 0;
foreach $val (@{$value->{"cities"}}) {
    print "$key => $val<br>\n";
    $key++;
}
</PRE>
djm at web dot us dot uu dot net
19-Oct-1999 05:45
Since there aren't any examples of reversing the process, here's one. If you had the packet produced by the above example (without the htmlentities() call), you could retrieve the values like this:

<pre>
$value = wddx_deserialize($packet);
print "pi is:<br>" . $value["pi"] . "<p>\n";
print "cities is:<br>\n";
while (list($key, $val) = each($value["cities"])) {
    print "$key => $val<br>\n";
}
</pre>

which outputs:

<pre>
pi is:
3.1415926

cities is:
0 => Austin
1 => Novato
2 => Seattle
</pre>
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wddx_add_vars> <wddx examples
Last updated: Fri, 25 May 2012