新版PHP极大的增强功能和性能
性能
在经过长达8个月的开发和测试以后，PHP 4.3.0正式发布了。就范围，时间，成就方面而言，这是最全面的PHP发行版，而且，作为综合用途的脚本语言舞台的一个重要的竞争者，它将更进一步的提高了PHP的地位。
命令行界面
这个版本最终完成了独立的命令行界面(CLI)，这可以（配合PHP-GTK一起）用于开发内核和桌面应用程序。CLI是内建部分，但是在配置过程中，只有当CGI版本使用--disable-cgi开关时候，才自动安装；或者使用make install-cli 。在Windows系统中，可以在cli目录找到CLI。
与其他服务器API相比较，CLI有许多的不同。请在“PHP手册：命令行中使用PHP”一章中找到更详细的内容。
Streams流
streams流API是一个非常重要的未披露的特征。在PHP内核和扩展中，引进了统一的方法来处理文件、管道、sockets和其他I/O资源。
这意味着对用户来说，任何使用streams流的I/O函数（和几乎所有这些函数）可以访问内置的协议，例如HTTP/HTTPS和FTP/FTPS，也可以通过PHP脚本登记使用自定义协议。请参考“已支持的协议/包列表”以获取更详细的内容。
新安装系统
安装系统在其他重复的地方，使用了一个全局的Makefile代替了缓慢的递归，并且降低了固定的相关性的综合程度。aclocal工具只需要automake。整个安装过程更轻便，消耗更少资源。
改进
PHP 4.3.x有许多的改进和增强的地方：
捆绑发行GD库而且推荐一直使用捆绑的版本的GD库
vpopmail和cybermut扩充移到PECL
删除几个不常用的扩充（aspell, ccvs, cybercash, icap）和SAPIs（fastcgi,fhttpd）
提高了各种字符串处理函数的速度
删除Apache2过滤器，还在实验中（由于许多扩充基于外部的库是不安全的，在prefork中使用PHP和工人模式）
修正各种安全隐患(imap, mysql, mcrypt, file upload, gd等等)
在其他应用程序植入新的SAPI到PHP中（实验性）
大量的测试套件
在dba, gd, pcntl, sybase和xslt扩展重要的改进
新增的debug_backtrace()有助于调试
现在错误信息可以链接到描述错误或者函数问题的网页
Zend引擎修正小错误和做了小的性能的提高
大量的其他修正，更新和新功能等等
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