The DEVELOPMENT of PHP
PHP began life as a way to manage a small personal website and was imagined and realized by just one man, Ramsus Lerdorf. Originally dubbed Personal Home Page Tools, PHP quickly evolved over the years from the basic scripting engine for a personal website into a highly competitive, extremely robust code engine that is deployed on millions of websites across the globe. PHP's fast, effective engine; its widespread, open-source developer base; and its platform flexibility have all come together to create one of the world's most effective online scripting languages.
much more.
As the Internet continues to evolve, so too does the necessity for a language that addresses the functionality needs of the Internet's web viewers. Over time, some programming languages have come and gone, and others have continued to evolve. Several languages have moved into the lead in the race for supremacy. Although languages such as ColdFusion,ASP.NET, and CGI certainly have their advantages, PHP seems to be the developer's choice for a versatile, open-source solution.
PHP最初只是为了管理一个小小的个人网站,而且它的构想和实现都是由一个人完成的,他就是Ramsus Lerdorf.PHP最初称为俱主页工具（Personal Home Page Tools）,但经过多年的发展,它很快从最早面向个人网站的基本脚本引擎演变成为一个有很强竞争力、相当健壮的编码引擎,目前全世界已经有数百万的网站部署了这个引擎.PHP有很多优点,它是一个快速、有效的引擎,拥有广泛的开源开发人员群体,而且具有平台灵活性,所有这些使得PHP成为世界上最有效的在线脚本语言之一.
随着互联网的不断发展,必须有一种语言来解决互联网的网站中观众需求的必要性.随着时间的推移,已经出现了一些编程语言,和其他语言继续发展.几种语言都已经进入了在一场激烈的竞争导致.虽然例如ColdFusion,ASP.NET语言,和CGI,固然有其优势,但PHP的似乎是一个多功能,开放源码的解决方案开发人员的选择.
在学习任何东西之前,我们都得了解这门东西究竟是什么,有什么用.学习PHP一样如此.
第一段：什么是PHP
PHP,全称 Hypertext Preprocessor ,中文翻译"超文本预处理器".
在PHP的官网是这样介绍PHP的：
PHP is a popular general-purpose scripting language that is especially suited to web development.
Fast, flexible and pragmatic, PHP powers everything from your blog to the most popular websites in the world.
照顾英文能力较差的同学,以下为中文版
PHP是一种被广泛应用的开源通用脚本语言,尤其适用于 Web 开发.
拥有快速,灵活,实用的特点,PHP能做任何事,包括你的个人博客甚至是全球性的大型站点系统.
PHP内核由C开发,所以呢在语法上跟C有不少相似之处.但PHP绝对不是C.
PHP语法除了跟C有相似之处外,还跟Java、Perl比较流行的编程语言存在相似的地方.所以呢,如果你有上述语言基础,PHP入门会更加快速.
第二段：PHP能干什么
PHP能干任何事！
PHP能直接嵌入HTML语言中,与HTML混编.PHP开发的目的主要是允许 web 开发人员快速编写动态生成的 web 页面,但 PHP 的用途远不只于此.
PHP还包含了命令列执行接口(command line interface),和产生图形使用者接口(GUI)程式.
第三段：为什么选择PHP
①.、PHP开源免费,没有任何收费的项目.你可以随便修改他的内核然后用于自己的商业使用.
PHP (recursive acronym for "PHP: Hypertext Preprocessor") is a widely-used Open Source general-purpose scripting language that is especially suited for Web development and can be embedded into HTML.
Simple answer, but what does that mean? An example:
Example 1.1. An introductory example
html
head
titleExample/title
/head
body
php
echo "Hi, I'm a PHP script!";
/body
/html
Notice how this is different from a script written in other languages like Perl or C -- instead of writing a program with lots of commands to output HTML, you write an HTML script with some embedded code to do something (in this case, output some text). The PHP code is enclosed in special start and end tags that allow you to jump into and out of "PHP mode".
What distinguishes PHP from something like client-side JavaScript is that the code is executed on the server. If you were to have a script similar to the above on your server, the client would receive the results of running that script, with no way of determining what the underlying code may be. You can even configure your web server to process all your HTML files with PHP, and then there's really no way that users can tell what you have up your sleeve.
The best things in using PHP are that it is extremely simple for a newcomer, but offers many advanced features for a professional programmer. Don't be afraid reading the long list of PHP's features. You can jump in, in a short time, and start writing simple scripts in a few hours.
PHP is a reflective programming language originally designed for producing dynamic web pages. PHP is used mainly in server-side scripting, but can be used from a command line interface or in standalone graphical applications. Textual User Interfaces can also be created using ncurses.
The main implementation is produced by The PHP Group and released under the PHP License. It is considered to be free software by the Free Software Foundation. This implementation serves to define a de facto standard for PHP, as there is no formal specification.
History
Support for object-oriented programming
The PHP Data Objects extension, which defines a lightweight and consistent interface for accessing databases
Performance enhancements
Better support for MySQL
Embedded support for SQLite
Integrated SOAP support
Data iterators
Error handling via exceptions
Usage
PHP generally runs on a web server, taking PHP code as its input and creating Web pages as output, however it can also be used for command-line scripting and client-side GUI applications. PHP can be deployed on most web servers and on almost every operating system and platform free of charge. The PHP Group also provides the complete source code for users to build, customize and extend for their own use.
Server-side scripting
Examples of popular server-side PHP applications include phpBB, WordPress, and MediaWiki.
一个PHP应用程序的组件
为了处理和开发动态网页,你需要理解和使用多种技术.有三个主要组件创建动态网页：Web服务器,服务器端编程语言和数据库.这是一个好主意,有一个网络的三个组成部分使用PHP开发的基本认识.开始与一些历史和Apache的目的（您的Web服务器）基本的了解,PHP的（您的服务器端编程语言）和MySQL（数据库）.这可以帮助您了解它们如何在Web开发与之相适应.
PHP的真正的美在于它的简单与权力相结合,以及它是一种解释语言,而不是编译之一.
除了能够精确显示 Web 页面的内容,用户还可以使用 PHP 发送 HTTP 报头.用户可以通过 PHP 设置 cookies ,管理用户身份识别,并对用户浏览页面进行重定向. PHP 还具有非常强大的数据库支持功能,能够访问几乎目前所有较为流行的数据库系统.此外, PHP 还可以与多个第三方系统集成,为用户提供更多的实用功能,如生成 PDF 文件等.
在 Web 页面中,所有 PHP 代码都放置在 "?" 和 "? "中.此外,用户还可以选择使用 SCRIPT LANGUAGE=php/SCRIPT 的形式. PHP 引擎会自动识别并处理页面中所有位于 PHP 定界符之间的代码.
PHP 脚本语言的语法结构与 C 语言和 Perl 语言非常相似.用户在使用变量前不需要对变量进行声明.使用 PHP 创建数组的过程也非常简单. PHP 还具有基本的面向对象组件功能,可以极大的方便用户有效组织和封装自己编写的代码.
都说到这里了大家应该明白, 使用 PHP编程 的最大好处是 编程 语言非常容易,系统功能库非常丰富.用户只需要很少的 编程 知识就能使用 PHP 建立一个真正交互的 Web 站点. PHP 正迅速变成一种标准的、多用途的、面向对象的脚本语言,成为新一代先进流行的 Web 系统开发技术.
网易有这语言的视频教程,可以去看看!
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