PHP新手疑惑
以前学过.net与java
目前自己看了看PHP 发现PHP较之前两个 好像封装的很不好,感觉好像ASP
看了看PHP说明 上面说PHP也有面向对象的设计模式 MVC 等等框架。
下面是这几天看PHP 中一些不懂得问题 希望高手解答疑惑!感激不尽
1.PHP中有无类似List
我定义了一个Model(UserInfo)
当我查询数据库所有的Userinfo结果集的时候 我该怎么获得 然后再也没显示呢?
2.PHP 中如何实现 WEB与PHP代码的分离?
例如java中的servlet与jsp页面那样?
------解决方案--------------------
1,
$m = M('UserInfo');
$list = $m->select();
/*
$this->assign(...$list);
$this->display;
*/
print_r($list);
2,模板替换,就是1中的assign,其实就是将$list变量替换到预先写好的模板文件中的对应位置, 这个模板一般和当前控制器同名, 在Tpl目录下。
MVC... 你非要像JAVA那样的MVC, 在PHP里真心没必要, 在PHP里个人感觉MVC更多的是编程设计的概念, 框架非常多, 都是爱好者写的, 不就是分层么, 谁都会, 只是何必去照某个框架规矩办事呢, PHP就应该足够简单,足够敏捷,框架是个人习惯,想用也很简单,可以说太简单。
------解决方案--------------------
1: 有数组
2: 实例化后调用类方法即可。
3:smarty/自定义模板
------解决方案--------------------
回答的太精辟了
------解决方案--------------------
PHP手册PHP code
#1:$result = mysql_query("SELECT id, name, salary FROM employees",$conn);while (list($id, $name, $salary) = mysql_fetch_row($result)) { echo " <tr>\n". " <td><a href="%5C%22info.php?id=%24id%5C%22">$name</a></td>\n". " <td>$salary</td>\n". " </tr>\n";}#不过一般将其循环的结果集放入数组,然后再页面调用,便于读懂代码,这就涉及到第二个问题:#php code:$result = mysql_query("SELECT id, name, salary FROM employees",$conn);$arr = array();while ($rows = mysql_fetch_array($result,MYSQL_ASSOC)) { array_push($arr,$rows);}#html code:<?php if(!empty($arr)){ foreach($arr as $array){?>
ID
=$array['id']?>
Name
=$array['name']?>
------解决方案--------------------
上面的同学们都已经从不同角度回答了一些,
我再说两句,
0. php的确不如.net/java封装得好. 因为php是一个渐变的语言, 从过程逐渐发展到OO, 它同时也是一个合作开发的开源语言, 不同的作者会带给它不同风格的东西,同时因为流行的程度,兼容也很重要. 无法像.net那样彻底抛开asp.
1. php有array,可以当list使用,spl里也提供了其它一些容器.
但是php里不会有泛型的概念,因为php是动态类型
2. 模板. 参加楼上们的回答

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.

Fibers was introduced in PHP8.1, improving concurrent processing capabilities. 1) Fibers is a lightweight concurrency model similar to coroutines. 2) They allow developers to manually control the execution flow of tasks and are suitable for handling I/O-intensive tasks. 3) Using Fibers can write more efficient and responsive code.

The PHP community provides rich resources and support to help developers grow. 1) Resources include official documentation, tutorials, blogs and open source projects such as Laravel and Symfony. 2) Support can be obtained through StackOverflow, Reddit and Slack channels. 3) Development trends can be learned by following RFC. 4) Integration into the community can be achieved through active participation, contribution to code and learning sharing.

PHP and Python each have their own advantages, and the choice should be based on project requirements. 1.PHP is suitable for web development, with simple syntax and high execution efficiency. 2. Python is suitable for data science and machine learning, with concise syntax and rich libraries.

PHP is not dying, but constantly adapting and evolving. 1) PHP has undergone multiple version iterations since 1994 to adapt to new technology trends. 2) It is currently widely used in e-commerce, content management systems and other fields. 3) PHP8 introduces JIT compiler and other functions to improve performance and modernization. 4) Use OPcache and follow PSR-12 standards to optimize performance and code quality.

The future of PHP will be achieved by adapting to new technology trends and introducing innovative features: 1) Adapting to cloud computing, containerization and microservice architectures, supporting Docker and Kubernetes; 2) introducing JIT compilers and enumeration types to improve performance and data processing efficiency; 3) Continuously optimize performance and promote best practices.


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