--enable-sysvsem
包括对Sys V 信号(大部分Unix系统都支持)。请参看信号和共享内存文档来获取更多信息。
--enable-sysvshm
包括对Sys V 共享内存的支持(大部分的Unix系统都支持)。请参阅信号和共享内存文档来获取更多信息。
--with-xml
包括对一种非正式版本的XML语法的支持,使用的是James Clark’s expat library。参阅XML 函数指南获取细节。
--enable-maintainer-mode
打开额外的相关和编译警告信息,这些信息经常被PHP3的开发人员所使用。
--with-system-regex
使用系统正则表达式的库胜于使用捆绑的那一个。如果你将PHP3编译为服务器组件,编译时和连接服务器时必须使用同一个库。如果系统中有你所需要的东西,就打开这个选项,如果可能,推荐你使用同PHP3捆绑在一起的库。
--with-config-file-path
这个路径是PHP3启动时用来寻找php3.ini文件位置的。
--with-exec-dir
仅仅允许在处于安全模式下的目录里执行,默认是 /usr/local/bin/。这个选项只能被设置为默认,他可以后来通过修改配制文件里的safe_mode_exec_dir来实现。
--disable-debug
在库中或执行中不包括调试信息。调试信息可以帮助你迅速查明问题所在,因此,只要PHP还处在alpha或beta的测试阶段,最好保留调试信息。
--enable-safe-mode
缺省是打开”safe_mode”(安全模式)选项,这个选项强加于PHP功能一些限制,如你只能在打开你在WEB根目录下面的文件,请详细阅读安全那一章以获得详细信息。CGI用户应该总保持这个选项是打开的。这个选项只能被设置为缺省,但是你可以后来通过修改配置文件(php3.ini)来打开或关闭这个选项。
--enable-track-vars
使用PHP3来保存从HTTP_GET_VARS, HTTP_POST_VARS 或 HTTP_COOKIE_VARS. 来的请求GWT/POST/cookie的轨迹。这个选项被设为缺省值,用户也可以在以后在 configuration file中设置track_vars的值来改变它的属性(enabled或者disabled)。
--enable-magic-quotes
设置使魔术引用成为缺省值。这个选项仅仅设置这种缺省情况,它可以使用在configuration file中指定magic_quotes_runtime的方法设置为可用或不可用。请参考有关 magic_quotes_gpc 和magic_quotes_sybase的相应内容。
--enable-debugger
激活内在的PHP3 debugger支持。这个特性还仅仅处于实验的阶段。请参考configuration file.中Debugger Configuration 的有关内容。
--enable-discard-path
如果该属性被置为可用,PHP的二进制CGI能够安全的被防置在WED树以外的地方,同时他人不能采用某种特殊的手段来获得存取权。请参考section in the security chapter中关于这个选项的内容。
--enable-bcmath
使BC风格的任意精度数学函数可以使用。请参考configuration file中有关 configuration file的选项。
--enable-force-cgi-redirect
使用安全检查内部服务器的重新定向。如果用户在Apache上运行CGI程序需要使用这个特性。
当把PHP当成CGI二进制来使用时,作为缺省的设置,PHP将首先检查它是否被重新定向所使用(例如,在Apache上使用活动指示)。这将确认PHP二进制不能被用来直接调用从而跳过标准的WEB服务器身份鉴定程序,例如:http://my.host/cgi-bin/php/secret/doc.html。这个例子存取了http://my.host/secret/doc.html,但是没有进行过HTTPD为目录/secret所做的安全设置。
不使用这个选项而关闭这种检查同时使用旁路HTTPD安全和身份设置。如果您要这样做的话,除非是您的服务器软件不能指出一种安全的重新定向;同时在您的文件夹根目录和用户目录中的文件将被任何人存取。
请参考安全那一章中有关这个选项的内容。
--disable-short-tags
禁止短形势的PHP3标签 ?>。如果你想使用XML(扩展标记语言)的话,就必须禁用 ?>,那么,PHP的代码标签就只剩下了。这个选项只能被设置为默认。可以通过修改配置文件里的short open tag指令来打开或者关闭这个选项。
--enable-url-includes
通过include()函数,PHP3能够直接运行其它HTTP和FTP站点的代码。参阅配置文件里的include path选项。
--disable-syntax-hl
关闭语法突出显示功能。
CPPFLAGS and LDFLAGS
为了能在PHP的安装过程中能在不同的路径下找到头文件和库文件,修改cppllags和ldflags环境变量。如果你正在使用一种智能shell(命令解释程序),你应当能够设置LDFLAGS=-L/my/lib/dir CPPFLAGS=-I/my/include/dir ./configure

PHP remains important in modern web development, especially in content management and e-commerce platforms. 1) PHP has a rich ecosystem and strong framework support, such as Laravel and Symfony. 2) Performance optimization can be achieved through OPcache and Nginx. 3) PHP8.0 introduces JIT compiler to improve performance. 4) Cloud-native applications are deployed through Docker and Kubernetes to improve flexibility and scalability.

PHP is suitable for web development, especially in rapid development and processing dynamic content, but is not good at data science and enterprise-level applications. Compared with Python, PHP has more advantages in web development, but is not as good as Python in the field of data science; compared with Java, PHP performs worse in enterprise-level applications, but is more flexible in web development; compared with JavaScript, PHP is more concise in back-end development, but is not as good as JavaScript in front-end development.

PHP and Python each have their own advantages and are suitable for different scenarios. 1.PHP is suitable for web development and provides built-in web servers and rich function libraries. 2. Python is suitable for data science and machine learning, with concise syntax and a powerful standard library. When choosing, it should be decided based on project requirements.

PHP is a scripting language widely used on the server side, especially suitable for web development. 1.PHP can embed HTML, process HTTP requests and responses, and supports a variety of databases. 2.PHP is used to generate dynamic web content, process form data, access databases, etc., with strong community support and open source resources. 3. PHP is an interpreted language, and the execution process includes lexical analysis, grammatical analysis, compilation and execution. 4.PHP can be combined with MySQL for advanced applications such as user registration systems. 5. When debugging PHP, you can use functions such as error_reporting() and var_dump(). 6. Optimize PHP code to use caching mechanisms, optimize database queries and use built-in functions. 7

The reasons why PHP is the preferred technology stack for many websites include its ease of use, strong community support, and widespread use. 1) Easy to learn and use, suitable for beginners. 2) Have a huge developer community and rich resources. 3) Widely used in WordPress, Drupal and other platforms. 4) Integrate tightly with web servers to simplify development deployment.

PHP remains a powerful and widely used tool in modern programming, especially in the field of web development. 1) PHP is easy to use and seamlessly integrated with databases, and is the first choice for many developers. 2) It supports dynamic content generation and object-oriented programming, suitable for quickly creating and maintaining websites. 3) PHP's performance can be improved by caching and optimizing database queries, and its extensive community and rich ecosystem make it still important in today's technology stack.

In PHP, weak references are implemented through the WeakReference class and will not prevent the garbage collector from reclaiming objects. Weak references are suitable for scenarios such as caching systems and event listeners. It should be noted that it cannot guarantee the survival of objects and that garbage collection may be delayed.

The \_\_invoke method allows objects to be called like functions. 1. Define the \_\_invoke method so that the object can be called. 2. When using the $obj(...) syntax, PHP will execute the \_\_invoke method. 3. Suitable for scenarios such as logging and calculator, improving code flexibility and readability.


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