PHP扩展模块Pecl、Pear以及Perl的区别_php技巧
一、简短总结:
pear:一个书写的比较规范,国外较流行的工具箱代码集
pecl:php扩展包,但不属于php基本扩展范围
perl:一种早于php出现的脚本级语言,php借鉴了他的正则表达式部分
二、Pear、Pecl都是PHP扩展模块的集合。是扩展PHP的两种方法:
A.一种是用纯粹的PHP代码写函数和类。
Pear就是这样一个项目。PEAR是PHP的官方开源类库(PHP Extension and Application Repository的缩写)。Pear在英文中是梨子的意思。PEAR将PHP程序开发过程中常用的功能编写成类库,涵盖了页面呈面、数据库访问、文件操作、数据结构、缓存操作、网络协议等许多方面,用户可以很方便地使用。它是一个PHP扩展及应用的一个代码仓库,简单地说,PEAR就是PHP的cpan。其主页是pear.php.net。
B.另外一种是用c或者c++编写外部模块加载至php中。
Pecl(The PHP Extension Community Library)就是干这个事的,PHP的标准扩展,可以补充实际开发中所需的功能。所有的扩展都需要安装,在Windows下面以DLL的形式出现;在linux下面需要单独进行编译,它的表现形式为根据PHP官方的标准用C语言写成,尽管源码开放但是一般人无法随意更改源码。其主页是pecl.php.net。
最直接的表述:Pear是PHP的上层扩展,Pecl是PHP的底层扩展。
这两种方法其实都是为特定的应用提供现成的函数或者类,本质上来说都是一样的。
三、PEAR, PECL和Perl的区别
PEAR是PHP扩展与应用库(the PHP Extension and Application Repository)的缩写。它是一个PHP扩展及应用的一个代码仓库,简单地说,PEAR就是PHP的CPAN。
PECL (PHP Extension Community Library),PHP的扩展库,它提供了一系列已知的扩展库,由C++等其他语言编写而成,多数以Dll(动态链接库)的形式体现,为比PEAR更快,但是与PEAR不同的是,PECL需要在服务器上配置并被注册到主机中。
Perl (Practical Extraction and Report Language)最初的设计者为拉里·沃尔(Larry Wall),他于1987年12月18日发表。Perl借取了C、sed、awk、shell scripting以及很多其他程序语言的特性。其中最重要的特性是它内部集成了正则表达式的功能,以及巨大的第三方代码库CPAN。简而言之,Perl象C一样强大,象awk、sed等脚本描述语言一样方便。Perl 一般被称为“实用报表提取语言”(Practical Extraction and Report Language),你也可能看到“perl”,所有的字母都是小写的。一般,“Perl”,有大写的 P,是指语言本身,而“perl”,小写的 p,是指程序运行的解释器。

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