恩，我想说的是，是不是经常有人在开发的时候，特别是和第三方有接口的时候，走的是SOAP协议，然后用户给你一个WSDL文件，说按照上面的进行适配，嘿嘿，这个时候，要是你以前没有开发过，肯定会傻眼，那如果你想学习的话，就认真的看下面的讲解咯：

一、WSDL概述
        WebServices Description Language (WSDL Web服务语言)是一个用于精确描述Web Service的文档格式。
        WSDL非常适合于用作代码生成器，它能够读取WSDL文档，并且可以为访问Web服务生成一个程序化的接口，大多数软件供应商和主要的标准机构（包括 W3C、WS-I和oasis）都支持WSDL。例如：JAX-RPC provider（例如：BEA Weblogic）通过API用WSDL生成相应的占位程序；IBM WebSphere、Microsoft.NET以及Apache Axis都有自己的工具生成相关的代码。下图是一个例子：
                                       

二、WSDL基本结构
        WSDL文档是一个遵循WSDL XML模式的XML文档（文档实例）；类似于：SOAP文档是一个遵循SOAP XML模式的XML文档（文档实例）；
        一个WSDL文档的根元素是deFinitions元素，WSDL文档包含7个重要的元素：types,import,message,portType,operations,binding和service元素。

三、WSDL声明
      
        3.1 XML声明

            WSDL的声明必须定义成使用：UTF-8 或者UTF-16 编码。

        3.2 deFinition元素
              所有WSDL文档的根元素都是deFinition元素。   

         上面的例子中：message元素利用name属性指定了标签（例如：GetBookPriceRequest），这些标签会自动使用targetNamespace的命名空间，标签了的messages元素通常被称为定义。
          文档中的其他元素用标签和命名空间前缀去应用定义，例如上面的例子中：input元素是使用mh:GetBookPriceRequest来引用标签GetBookPriceRequest。

         3.3 Types元素
               Types元素用作一个容器，定义了自定义的特殊数据类型，在声明消息部分（有效负载）的时候，messages定义使用了types元素中定义的数据类型与元素。

/**
 * Copyright (c) 2005, Braulio Jos?Solano Rojas
 * All rights reserved.
 * 
 * Redistribution and use in source and binary forms, with or without modification, are
 * permitted provided that the following conditions are met:
 * 
 *     Redistributions of source code must retain the above copyright notice, this list of
 *     conditions and the following disclaimer. 
 *     Redistributions in binary form must reproduce the above copyright notice, this list of
 *     conditions and the following disclaimer in the documentation and/or other materials
 *     provided with the distribution. 
 *     Neither the name of the Solsoft de Costa Rica S.A. nor the names of its contributors may
 *     be used to endorse or promote products derived from this software without specific
 *     prior written permission.
 * 
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND
 * CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES,
 * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
 * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
 * EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 * 
 *
 * @version $Id: SoapDiscovery.class.php 66 2013-04-10 07:12:21Z ideaa $
 * @copyright 2005 
 */
/**
 * SoapDiscovery Class that provides Web Service Definition Language (WSDL).
 * 
 * @package SoapDiscovery
 * @author Braulio Jos?Solano Rojas
 * @copyright Copyright (c) 2005 Braulio Jos?Solano Rojas
 * @version $Id: SoapDiscovery.class.php 66 2013-04-10 07:12:21Z ideaa $
 * @access public
 * */
class SoapDiscovery {
    private $class_name = '''';
    private $service_name = '''';
    /**
     * SoapDiscovery::__construct() SoapDiscovery class Constructor.
     * 
     * @param string $class_name
     * @param string $service_name
     * */
    public function __construct($class_name = '''', $service_name = '''') {
        $this->class_name = $class_name;
        $this->service_name = $service_name;
    }
    /**
     * SoapDiscovery::getWSDL() Returns the WSDL of a class if the class is instantiable.
     * 
     * @return string
     * */
    public function getWSDL() {
        if (empty($this->service_name)) {
            throw new Exception(''No service name.'');
        }
        $headerWSDL = "<?xml version=\"1.0\" ?>\n";
        $headerWSDL.= "\n";
        $headerWSDL.= "\n";
        if (empty($this-&gt;class_name)) {
            throw new Exception(''No class name.'');
        }
        $class = new ReflectionClass($this-&gt;class_name);
        if (!$class-&gt;isInstantiable()) {
            throw new Exception(''Class is not instantiable.'');
        }
        $methods = $class-&gt;getMethods();
        $portTypeWSDL = '''';
        $bindingWSDL = ''service_name . ''Binding" type="tns:'' . $this-&gt;service_name . "Port\"&gt;\n\n";
        $serviceWSDL = ''service_name . "\"&gt;\n\nservice_name . ''Port" binding="tns:'' . $this-&gt;service_name . "Binding\"&gt;\n\n\n";
        $messageWSDL = '''';
        foreach ($methods as $method) {
            if ($method-&gt;isPublic() &amp;&amp; !$method-&gt;isConstructor()) {
                $portTypeWSDL.= ''getName() . "\"&gt;\n" . ''getName() . "Request\" /&gt;\ngetName() . "Response\" /&gt;\n\n";
                $bindingWSDL.= ''getName() . "\"&gt;\n" . ''service_name . ''#'' . $this-&gt;class_name . ''#'' . $method-&gt;getName() . "\" /&gt;\n\n\n\n\n\n\n";
                $messageWSDL.= ''getName() . "Request\"&gt;\n";
                $parameters = $method-&gt;getParameters();
                foreach ($parameters as $parameter) {
                    $messageWSDL.= ''getName() . "\" type=\"xsd:string\" /&gt;\n";
                }
                $messageWSDL.= "\n";
                $messageWSDL.= ''getName() . "Response\"&gt;\n";
                $messageWSDL.= ''getName() . "\" type=\"xsd:string\" /&gt;\n";
                $messageWSDL.= "\n";
            }
        }
        $portTypeWSDL.= "\n";
        $bindingWSDL.= "\n";
        return sprintf(''%s%s%s%s%s%s'', $headerWSDL, $portTypeWSDL, $bindingWSDL, $serviceWSDL, $messageWSDL, '''');
    }
    /**
     * SoapDiscovery::getDiscovery() Returns discovery of WSDL.
     * 
     * @return string
     * */
    public function getDiscovery() {
        return "<?xml version=\"1.0\" ?>\n\n\n";
    }
}

调用Web Service的返回值。

从上面调用的本质来看，要一个语言支持web Service，唯一的要求是，改语言支持XML文档解析，生成，支持网络传输。