PHP概述.
1. PHP是什么?
2. PHP 代表什么?
3. 各版本之间有什么关系?
4. 我可以同时运行不同版本的PHP吗?
5. PHP 3 和 PHP 4有什么区别?
6. 我想我发现了一个BUG，我应该告诉谁 ?
1. PHP是什么?
在 手册前言上写到:
PHP是一种嵌入式HTML脚本语言。它的大多数语法来源于C，也有一部分PHP特性借鉴于Java 和 Perl 。这种语言的目的是让WEB开发 人员能够快速高效地写出动态生成的页面。
这儿 （在 Zend站点上）是 Stig S鎡her Bakken 写的一个好的PHP的介绍。 还有, 很多 PHP 资源 都是可以免费得到的.
2. PHP 代表什么?
PHP 代表什么？ PHP: 超文本预处理器. 这样的一种代表使很多人感到困惑，因为简写的头一个词就这简写本身。 这种类型的简写称为递归简写。 好奇的人可以阅览 在线免费计算机词典查阅更多的信息
3. 各版本之间有什么关系?
PHP/FI 2.0 是早期版本，现在它不再被支持。 PHP 3 是 PHP/FI 2.0 继承者， 比PHP 2要好一些。 PHP 4 是最终版本（目前）, 它使用了 Zend 引擎 机制。
4. 我可以同时运行不同版本的PHP吗?
是的，可以。详情参阅PHP源代码发行包里的 INSTALL 文件。当然,也要读一下相关的 附件.
5. PHP 3 和 PHP 4 有什么区别?
PHP 4 的书的作者们写了 许多文章 关于这个.下面是其中最重要的新特性：
扩展API模块
UNIX下通用的编译过程
通用WEB服务接口，支持多线程 WEB 服务器
改进的语法
内置HTTP session 支持
输出缓冲支持
更为强大的配置系统
引用计数
如果想看这些特性的细节，请参阅 What's new in PHP 4 overview 如果你正在从PHP 3 转向PHP 4, 那还得读相关 附件。
6. 我想我发现了一个 bug! 我应该告诉谁?
你首先应该去 PHP Bug Database 查一下，确认这不是一个已知的 bug。 如果在数据库里没有发现它,那么就填写报告表格来报告这个bug。 记住，一定要使用 bug 而不是简单地通知给一个邮件组，因为在数据库里bug 会分配一个 tracking number 以便于你将来返回来查询bug的进展状态。 bug database可以在下面的地址找到： http://bugs.php.net/.
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