PHP3中文文档（转）
第1章 PHP3 入门
什么是PHP3?
PHP3.0版本是一种服务器端HTML-嵌入式脚本描述语言。
PHP3能做什么？
也许PHP3最强大和最重要的特征是他的数据库集成层，使用它完成一个含有数据库功能的网页是不可置信的简单。目前支持下面所列的数据库。
Oracle
Adabas D
Sybase
FilePro
MSQL
Velocis
MySQL
Informix
Solid
dBase
ODBC
Unix dbm
PostgreSQL
PHP的简要历史
PHP从1994年秋天开始孕育，他的创始人是Rasmus Lerdorf。早期没有发布的版本是被他用在自己的网页上来跟踪有谁来参观过他的在线个人简历。被其他人使用的第一个版本是在1995年发布的，当时叫做Personal Home Page Tools。他包含了一个非常简单的语法分析引擎，只能理解一些指定的宏和一些Home Page后台的常见功能，如留言本，计数器和一些其他的素材。在1995年中期，重写了这个语法分析引擎并且命名为PHP/FI 2.0版本。FI来源于Rasmus所写的另一个可以接受Html表单数据的程序包。他组合了Personal Home Page Tools 脚本和Form Interpreter，并且加入了对mSQL的支持，于是PHP/FI 2.0诞生了。PHP/FI以惊人的速度发展，并且其他的人也开始对他的源码加以改进和修改。
很难给出任何精确的统计数字，但是据估计到1996年末至少有15,000个WEB站点在使用PHP/FI 2.0，到了1997年中，这个数字已经成长为50,000个，1997年中PHP的发展也已经有了一些变化，他已经从Rasmus的宠物项目变成了更加有组织的团体项目。语法分析引擎也由Zeev Suraski 和 Andi Gutmans进行了重新改写，这个引擎构成了PHP3的基础。PHP/FI中的大部分通用代码都经过改写后引入了PHP3中。
今天（1998年中），有许多商业的产品如C2's StrongHold web server和Red Hat Linux都开始支持PHP3或PHP/FI，根据由NetCraft提供的数字进行保守的推断，现在在世界各地大概有150,000个WEB站点在使用PHP或PHP/FI。从前景上看，在InterNet上这些站点远远比运行Netscape's flagship Enterprise server的要多。
使用PHP3进行HTTP认证
只有在PHP以Apache的模块方式运行的时候才可以使用HTTP认证的功能。在Apache的模块PHP脚本中，可以使用Header()函数向客户断浏览器发送一个”Authentication Required”的消息，使浏览器弹出一个用户名/密码（username/password）的输入窗口，当用户输入用户名和密码后，包含PHP脚本的URL将会被再次调用，使用分别代表用户名，密码，和确认方式的$PHP_AUTH_USER, $PHP_AUTH_PW，$PHP_AUTH_TYPE变量。现在只有”BASIC”的确认方式被支持。
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