PHP技术(转)
PHP是一个基于服务端来创建动态网站的脚本语言,您可以用PHP和HTML生成网站主页。当一个访问者打开主页时,服务端便执行PHP的命令并将执行结果发送至访问者的浏览器中,这类似于ASP和CoildFusion,然而PHP和他们不同之处在于PHP开放源码和跨越平台,PHP可以运行在WINDOWS NT和多种版本的UNIX上。它不需要任何预先处理而快速反馈结果,它也不需要mod_perl的调整来使您的服务器的内存映象减小。PHP消耗的资源较少,当PHP作为Apache Web服务器一部分时,运行代码不需要调用外部二进制程序,服务器不需要承担任何额外的负担。
除了能够操作您的页面外,PHP还能发送HIIP的标题。您可以设置cookie,管理数字签名和重定向用户,而且它提供了极好的连通性到其它数据库(还有DBC),集成各种外部库来做用PDF文档解析XML的任何事情。
有了PHP就无需特殊的开发环境和IDE,您可以以作为PHP代码块的结束,当然您也可以用带有 的标记甚至用的ASP的格式来配置 PHP,PHP会在那些标志间处理所有的事情。
PHP的编程语言类似与C和Perl。在使用它们之前您没必要声明任何变量,而且建立数组和Hash是很简单的事情。PHP还有一些面向对象的特征,可以为组织和打包您的代码提供很好的帮助。
虽然PHP在Apache里能快速运行,但是在PHP网站里有一些用来对Microsoft IIS 和 Netscape Enterprise Serer无缝结合的指令集。如果您还没有copy PHP的话,您可以在 http: // www.php.com 下载,您也可以使用操作手册,它里边包括了所有的关于PHP的功能和特性的说明
PHP 是一种用来制作动态网页的服务器端脚本语言。你通过PHP和HTML创建页面。当访问者打开网页时,服务器端便会处理 PHP 指令,然后把其处理结果送到访问者的浏览器上面,就好像 ASP 或者是 ColdFusion 一样。然而,PHP 跟 ASP 或 ColdFusion 不一样的地方在于,它是跨平台的开放源代码。PHP 可以在 Windows NT 以及很多不同的 Unix 版本中执行,它也可以被编译为一个 Apache 模块,或者是一个CGI二进制文件。当被编译为 Apache 模快时,PHP 尤其轻巧方便。它没有任何繁琐程序所产生的负担,因此可以很快的返回结果,同时也不需为了保持较小的服务器内存映象,而去调整mod_perl。
除了能够用来产生你的网页的内容之外,PHP 也可以用来传送 HTTP头。你可以设定 cookies,授权管理,并将使用者重定向至新的页面。它也能好的访问很多数据库及ODBC。另外还可与各式各样的外部库集成,由此可以让你做几乎任何事情,从创建 PDF 文件到解析XML。
PHP 代码就嵌在Web页面中,因此你不必为它建立一个特别的开发环境或IDE。你用标志PHP代码(也可以将PHP设定成使用ASP形式的标志甚至是用)。PHP引擎会处理这些标志之间的任何东西。
PHP语言的语法跟C以及Perl很像。在使用前,你无须声明变量。要创建阵列以及散列(关联性阵列)也很快。PHP的初步面向对象特性还提供了组织及封装代码的简便方法。
尽管当嵌入 Apache 里面时,PHP运行最快,但在PHP相关站点上还是有关于如何使其与Microsoft IIS 以及 Netscape Enterprise Server无缝集成的操作指南。如果你还没有PHP,可以在其官方网站下载取得。在那里也可以找到一份包括PHP所有函数和特性的用户手册。
创建自己的命令
因为PHP脚本是写在 HTML 文档中的,你不必用特殊的编辑器来创建页面。不过你必须在支持PHP的服务器上面执行 PHP。如果你用的是你自己的服务器,则很容易办到。如果是通过ISP 服务处理页面,则需要联系你的 ISP 的客服小组请他们帮你安装PHP。
对于Unix系统,你必须具备基本的Unix技巧,例如会使用make以及一个C语言编译器。在你的系统上,还要有一个 ANSI C编译器,以及一个Web服务器。
对于Windows 95/NT ,你需要以下服务器之一:Microsoft Personal Web Server,Microsoft Internet Information Server 3 或4,Apache 1.3.x,或者Omni HTTPd 2.0b1。
你可以在PHP网站上找到所有安装设置PHP的相关信息。
David Sklar是Student.Net Publishing的首席信息官。
Adam Trachtenberg是Student.Net Publishing产品副主管。

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