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关于ZendOptimizer

Jun 13, 2016 am 10:25 AM
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关于Zend Optimizer
Hunte 2000年5月23日

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Zend Optimizer(以下简称ZO)用优化代码的方法来提高PHP 4.0应用程序的执行速度。实现的原理是对那些在被最终执行之前由运行编译器(Run-Time Compiler)产生的代码进行优化。

优化能提高你的盈利能力

一般情况下,执行使用ZO的PHP程序比不使用的要快40%到100%。这意味着网站的访问者可以更快的浏览网页,从而完成更多的事务,创造更好的客户满意度。更快的反应同时也意味着可以节省硬件投资,并增强网站所提供的服务。所以,使用ZO,就等于提高了电子商务的盈利能力。

ZO能给PHP用户带来很多益处,特别是那些运营网站的人。快速运行PHP程序可以显著降低服务器的CPU负载,并可以减少一半的反应时间,也就是从访问者点击链接到服务器开始读取页面之间的时间。

系统需求

当前版本的ZO(Beta 4)只能运行在PHP 4.0下。

对操作系统的要求如下:
- 基于glibc2.1的x86 Linux系统(Red Hat 6.1, Mandrake 7.0, Slackware 7.0及SuSE 6.1)
- 基于glibc2的x86 Linux系统(Red Hat 5.2, SuSE 6.1)
- 基于libc5的x86 Linux系统(Slackware 4.0, Debian 1.3.1r8)
- Sparc Solaris 2.6, 7和8
- FreeBSD 3.4和4.0
- Windows NT 4.0(不包括其它版本的Windows)

对PHP的要求如下:
- PHP 4.0.0:以外的版本均不被支持
- 同时支持CGI方式和Apache模块方式
- 在Windows下,PHP必须:1)是从http://www.php.net上下载的现成的WIN32执行版本;2)自己编译时带"Release_Ts"(Release Thread Safe)选项的。



安装过程

-UNIX
1 编译PHP,不要加调试选项-否则ZO不会工作:在配置是加上--disable-debug选项
2 复制ZendOptimizer.so文件到你的机器,通常放在:/usr/local/Zend/lib下
3 在php.ini文件中加入如下两行,不要包含任何空格:
zend_optimizer.optimization_level=7
zend_extension="/usr/local/Zend/lib/ZendOptimizer.so"
4 重新启动Apache服务器

-WINDOWS
1 从http://www.php.net下载WINDOWS版的PHP 4.0.0,这个版本不包含调试特性。
2 复制ZendOptimizer.dll文件到你的机器,通常放在:C:Program Filesendlib下
3 在php.ini文件中加入如下两行,不要包含任何空格:
zend_optimizer.optimization_level=7
zend_extension_ts="C:Program FilesendlibendOptimizer.dll"
4 如果需要的话,重新启动WEB服务器

Zend Optmizer常见问题

问:什么是Zend Optimizer;有什么用?
答:ZO仔细检查有运行编译器产生的代码,分析并做优化,让它运行得更快。

问:为什么要用ZO,难道PHP4还不够快吗?
答:的确,用于PHP4的标准运行编译器已经够快了--相同情况下比PHP3要快2-10倍。但使用了ZO的PHP程序的执行速度还会加快40%到100%。

问:ZO在PHP4软件安装的什么位置?
答:ZO位于PHP4的ZEND引擎中,介于运行编译器和最终执行器之间。

问:ZO的最终发布版本要付费吗?
答:不要。ZO的最终版本将继续作为免费软件来发布。ZEND技术公司不打算对任何ZO版本收费。

问:开发人员如何获知ZO是否在运行?
答:只要用PHP的函数phpinfo()来检测便知,如下所示:
phpinfo();
?>
显示的结果中关于ZO的部分就象下面这样:
This program makes use of the Zend scripting language engine:
Zend Engine v1.0, Copyright (c) 1998-2000 Zend Technologies Ltd.
with Zend Optimizer v0.98, Copyright (c) 1998-2000 by Zend Technologies
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