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# CXIX.WDDX Functions

# 介紹

These functions are intended for work with WDDX.

# 需求

In order to use WDDX, you will need to install the expat library (which comes with Apache 1.3.7 or higher).

# 安裝

After installing expat compile PHP with --enable-wddx.

Windows 版本的 PHP 已內建此延伸的支援﹐所以你毋須再載入附加的延伸來使用這些功能。

# 執行時期組態

`php.ini`中沒有定義此延伸的組態指令。

# 資源類型

這個延伸沒有定義任何資源。

# 預先定義常數

這個延伸沒有定義任何常數。

# 範例

All the functions that serialize variables use the first element of an array to determine whether the array is to be serialized into an array or structure. If the first element has string key, then it is serialized into a structure, otherwise, into an array.

示範 1.Serializing a single value with WDDX
`<?php echo wddx_serialize_value("PHP to WDDX packet example", "PHP packet"); ?>`
This example will produce:
    <wddxPacket version='1.0'><header comment='PHP packet'/><data>
    <string>PHP to WDDX packet example</string></data></wddxPacket>

示範 2.Using incremental packets with WDDX
`<?php $pi = 3.1415926; $packet_id = wddx_packet_start("PHP"); wddx_add_vars($packet_id, "pi"); /* Suppose $cities came from database */ $cities = array("Austin", "Novato", "Seattle"); wddx_add_vars($packet_id, "cities"); $packet = wddx_packet_end($packet_id); echo $packet; ?>`
This example will produce:
    <wddxPacket version='1.0'><header comment='PHP'/><data><struct>
    <var name='pi'><number>3.1415926</number></var><var name='cities'>
    <array length='3'><string>Austin</string><string>Novato</string>
    <string>Seattle</string></array></var></struct></data></wddxPacket>

> 備注: If you want to serialize non-ASCII characters you have to set the appropriate locale before doing so (see setlocale()).

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