java/>Java的易扩展性是它极其的令人兴奋的用途之一,通过学习如何使用这个模块,你可以扩展所有的可用到的Java类。为了使您了解到Java扩展性的基础,本篇文章包括系统的安装和一些PHP和Java一起使用的代码例子。 \n\n"
Windows下安装
以下的配置是基于Apache 1.3.12, PHP 4.0.3 (您可以在www.php4win.de下载)和JDK1.2.2 (您可以在java.sun.com下载)。我们已经在更老版本的JDK和Windows 95, Windows 98 and NT4下的各种的MS webservers(PWS和IIS)尝试过这种安装配置。
第一步:安装JDK
这个过程想当简单,由于JDK的安装没有过多的问题,但你需要做的是查看你的系统环境(在Windows9X中的autoexec.bat和NT环境下“控制面板”中的“系统”)并且确认JDK1.x.x\bin路径是否加载到path中。这个设置将会使你在编译Java类是变得更轻松。在Win9x中加入
PATH=%PATH%;C:\jdk1.2.2\bin
到你系统的autoexec.bat 在NT的系统中加入
;C:\jdk1.2.2\bin
到Path环境变量的末端。在系统中的autoexec.bat的标注是十分重要的。PHP的Java扩展将会忽JAVA_HOME和CLASSPATH在系统中的安装路径,这样一来,在php.ini中正确的设置这些项目就是十分的重要了。
第二步:修改你的php.ini
你需要加入如下的几项到你的php.ini文件
[java]
extension=php_java.dll
java.home = C:\jdk1.2.2
java.library = c:\jdk1.2.2\jre\bin\CLASSIC\jvm.dll
java.library.path=c:\web\php4\extensions\
java.class.path="c:\web\php4\extensions\jdk1.2.2\php_java.jar;c:\myclasses"
具有代表性的问题是,有些人会把extension=php_java.dll与其它的extensions在php.ini文件中放在一起,但是它正确的位置应该是在php.ini文件中的[java]下面。java.library.path一定是在php_java.dll中被设置好的,并且java.class.path中一定要包含php_java.jar的路径。java.class.path还要加入其它你可能使用其它的类的路径,正如上面所举的例子中的c:\myclasses,或者你也可以只写前面的那段路径。
第三步:测试你的安装成果
现在,你可以建立一了类似于这样的一段php程序了:
$system = new Java("java.lang.System");
print "Java version=".$system->getProperty("java.version")."
\n";
print "Java vendor=".$system->getProperty("java.vendor")."
print "OS=".$system->getProperty("os.name")." ".
$system->getProperty("os.version")." on ".
$system->getProperty("os.arch")."
\n";
$formatter = new Java("java.text.SimpleDateFormat","EEEE,
MMMM dd, yyyy 'at' h:mm:ss a zzzz");
print $formatter->format(new Java("java.util.Date"))."\n";
?>
这是一个Sam Ruby做的例子。如果你把没一项都设置好的话,你将会看到象这样的结果:
Java version=1.2.2
Java vendor=Sun Microsystems Inc.
OS=Windows 95 4.10 on x86
Wednesday, October 18, 2000 at 10:22:45 AM China Standard Time
(译者注:在本人的机器上运行的结果:
Java version=1.2.2
Java vendor=Sun Microsystems Inc.
OS=Windows 95 4.90 on x86
星期三, 三月 28, 2001 at 1:44:33 下午 GMT+08:00 )
这是一个非常简单的例子,但它可以告诉你用php如何访问java类,一旦你能让这个例子转起来,就说明你的php的java扩展已经安装成功。
原作者: Mark Nold,Joost Soeterbroek
来 源: phpbuild

PHP is a server-side scripting language used for dynamic web development and server-side applications. 1.PHP is an interpreted language that does not require compilation and is suitable for rapid development. 2. PHP code is embedded in HTML, making it easy to develop web pages. 3. PHP processes server-side logic, generates HTML output, and supports user interaction and data processing. 4. PHP can interact with the database, process form submission, and execute server-side tasks.

PHP has shaped the network over the past few decades and will continue to play an important role in web development. 1) PHP originated in 1994 and has become the first choice for developers due to its ease of use and seamless integration with MySQL. 2) Its core functions include generating dynamic content and integrating with the database, allowing the website to be updated in real time and displayed in personalized manner. 3) The wide application and ecosystem of PHP have driven its long-term impact, but it also faces version updates and security challenges. 4) Performance improvements in recent years, such as the release of PHP7, enable it to compete with modern languages. 5) In the future, PHP needs to deal with new challenges such as containerization and microservices, but its flexibility and active community make it adaptable.

The core benefits of PHP include ease of learning, strong web development support, rich libraries and frameworks, high performance and scalability, cross-platform compatibility, and cost-effectiveness. 1) Easy to learn and use, suitable for beginners; 2) Good integration with web servers and supports multiple databases; 3) Have powerful frameworks such as Laravel; 4) High performance can be achieved through optimization; 5) Support multiple operating systems; 6) Open source to reduce development costs.

PHP is not dead. 1) The PHP community actively solves performance and security issues, and PHP7.x improves performance. 2) PHP is suitable for modern web development and is widely used in large websites. 3) PHP is easy to learn and the server performs well, but the type system is not as strict as static languages. 4) PHP is still important in the fields of content management and e-commerce, and the ecosystem continues to evolve. 5) Optimize performance through OPcache and APC, and use OOP and design patterns to improve code quality.

PHP and Python have their own advantages and disadvantages, and the choice depends on the project requirements. 1) PHP is suitable for web development, easy to learn, rich community resources, but the syntax is not modern enough, and performance and security need to be paid attention to. 2) Python is suitable for data science and machine learning, with concise syntax and easy to learn, but there are bottlenecks in execution speed and memory management.

PHP is used to build dynamic websites, and its core functions include: 1. Generate dynamic content and generate web pages in real time by connecting with the database; 2. Process user interaction and form submissions, verify inputs and respond to operations; 3. Manage sessions and user authentication to provide a personalized experience; 4. Optimize performance and follow best practices to improve website efficiency and security.

PHP uses MySQLi and PDO extensions to interact in database operations and server-side logic processing, and processes server-side logic through functions such as session management. 1) Use MySQLi or PDO to connect to the database and execute SQL queries. 2) Handle HTTP requests and user status through session management and other functions. 3) Use transactions to ensure the atomicity of database operations. 4) Prevent SQL injection, use exception handling and closing connections for debugging. 5) Optimize performance through indexing and cache, write highly readable code and perform error handling.

Using preprocessing statements and PDO in PHP can effectively prevent SQL injection attacks. 1) Use PDO to connect to the database and set the error mode. 2) Create preprocessing statements through the prepare method and pass data using placeholders and execute methods. 3) Process query results and ensure the security and performance of the code.


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