Comparison of NuSOAP and PHPRPC_PHP Tutorial
因为看到有人问 Nusoap 和 PHPRPC 的比较,为了让大家能够更清楚地了解 Nusoap 和 PHPRPC 的关系,所以在这里做一个简要的说明性介绍,所写的内容也不是面面俱到的,只写了一些主要的比较。更多细节的比较大家可以在使用中自己来对比。 Nusoap 是一个用于 PHP 的 Web Service 实现。PHP 版本的 PHPRPC 协议实现跟 Nusoap 是一个级别的东西。但是 PHPRPC 协议是跟 Web Service 一个级别的东西,所以下面我们来把 Nusoap 实现跟 PHP 版本的 PHPRPC 协议实现进行比较,把 Web Service 和 PHPRPC 协议进行比较。 第一、协议比较: 相同之处: Second, let’s compare the Nusoap and PHP versions of the PHPRPC protocol implementation:
这两个协议都是基于 HTTP 协议的,都可以使用 POST 方法提交请求。
主要不同之处:
(1) 请求:WebService 虽然也支持 GET 方式提交请求,但是一般不常用,常用的方式是利用 POST 方法提交 SOAP 格式的请求。而 PHPRPC 支持 GET 和 POST 两种方式来提交请求,请求格式是最常见的 application/x-www-form-urlencoded 格式,这对于实现一个浏览器客户端来说更加容易。
(2) 响应:WebService 返回的响应是 SOAP 格式的数据,对于浏览器客户端来说,只有利用 XMLHttpRequest 才能够对其进行处理,因为 XMLHttpRequest 收到跨域调用的限制,因此 WebService 的浏览器客户端无法做到跨域调用服务。PHPRPC 的响应格式是兼容于 JavaScript 格式的纯文本,因此返回的响应可以直接作为脚本执行,因此实现浏览器客户端可以完全不依赖于 XMLHttpRequest,利用纯 JavaScript 即可实现一个浏览器客户端,而浏览器允许跨域下载并执行脚本,因此 PHPRPC 的浏览器客户端可以做到跨域调用。
(3) 数据交换格式:WebService 中所使用的 SOAP 格式是基于 XML 语言定义的,XML 语言是纯文本的,因为其中的某些位置可以增加或删除一些空白(空格、制表符、回车或换行)而不影响其所表示的内容,因此其格式可以整理成便于人来阅读的,但也由于这点的灵活性,对于机器处理来说效率偏低。而 PHPRPC 的数据交换格式是 PHP 序列化格式,PHP 序列化格式可以算是半纯文本的,因为其数据的表示格式也是采用人类可读的方式表示的,但其中任何位置都不可以插入多于的空白,它对机器的可读性作了很好的支持,不但提供了有效的分隔符,并且提供了字符串长度、数组元素个数、对象成员个数等信息,所以更有利于机器高速处理。因为协议本质上是机机语言,而不是计算机程序设计语言,计算机程序设计语言是人机语言,它应该更偏重于人类可读性,而机机语言应该更重视机器可读性。因此可以说 PHP 序列化格式在人类可读性和机器可读性之间做到了非常好的平衡。
(4) 带宽占用:WebService 是重量级的 Web 服务,其数据格式冗长拖沓,占用网络带宽高。PHPRPC 是轻量级的 Web 服务,其数据格式简单紧凑,占用网络带宽低。注意,这里所说到重量级和轻量级是指网络带宽占用,而不是指其提供服务的能力,PHPRPC 所提供的服务能力绝不逊色于 WebService,甚至在很多地方优于 WebService。打个比方说:WebService 就像是 OSI 的 7 层网络模型,看似完美,但实现复杂,使用困难。而 PHPRPC 则像是简化了的 TCP/IP 的 5 层网络模型,实现高效,使用方便。
The same thing is that they are both used in PHP.
The main difference lies in the ease of use. Although Nusoap is pretty good in terms of ease of use, it is far behind compared with the PHP version of the PHPRPC protocol implementation. For example, service functions published by Nusoap need to be written separately and cannot be written in the same way as local functions, let alone the built-in extended functions in PHP. However, the functions published by PHPRPC are exactly the same as local functions, even including PHP built-in functions. Extended functions can also be published directly. To use Nusoap to publish a wsdl, you need to define the name, parameter name, parameter type, return value type, namespace, action, style, document, etc. of each published process. To publish a PHPRPC service, you only need to tell the server the name of the function (which can also be an object method or a class method) to be published (an alias can also be given). There is no need to give information such as parameter names, parameter types, return value types, etc. Therefore, for variable-length parameters, variable type parameters have better support. It is also convenient to use the PHPRPC client. You can directly call the remote function using the method of the local PHPRPC client named with the remote function name, while Nusoap is relatively more troublesome. Another big advantage of PHPRPC is that it allows you to easily make remote calls through secure encrypted transmission, which Nusoap cannot do.

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