我是刚刚接触 smarty 模版引擎,所以对 smarty 理解不是很透彻.在用 smarty 时出现了这样的问题。
在做一个网页,需要用 smarty 循环打印从数据库提取的内容,遇到了困难。首先是提取数据传递的问题,按书上说的是把从数据库提取的内容放在一个数组中,传递给 smarty 模版,然后在模版中用 section 语句循环打印,但是始终没有成功。因为对 section 的语法不太理解。在循环打印时,如果按语法写 $article[line].id 就没有输出,我尝试改成 $article.id,这样编程循环打印其中某一个 id 的值很多遍,而不是把数据库中的每一个id值打印出来。
我反思了一下,出现这些问题的原因就是 smarty 的理解不够,只知其然而不知其所以然。 php 对我来说其实也是新事物,出现这些问题和对 php 中对数据库的 select 也有关。我的 php 的 select 返回的结果也不是很清楚,书上只教了怎么把结果用 while 循环打印,而没有说返回的结果怎么保存。我自己根据
<code>$result = mysql_query("SELECT * FROM article"); while($row = mysql_fetch_array($result)){ echo $row[id]; } </code>
这段代码,尝试把返回的结果放在一个数组中,像这样
<code>$result = mysql_query("SELECT * FROM article"); $row = mysql_fetch_array($result); $article = array('id' = $row[id], 'title' = $row[title]); </code>
然后把 $article 传递给 smarty,代码如下:
<code>$smarty->assign('article',$article); $smarty->display(index.tpl); </code>
但是在 index.tpl 中没有输出传过去的数据,所以我想是不是我的提取并传递数据库数据的方法有问题,因为不能深入理解,所以需要大家的帮忙了。我是一个新人,希望大家帮助我时能讲的详细一些,让我能理解内涵,做到知其然并知其所以然。
回复内容:
我是刚刚接触 smarty 模版引擎,所以对 smarty 理解不是很透彻.在用 smarty 时出现了这样的问题。
在做一个网页,需要用 smarty 循环打印从数据库提取的内容,遇到了困难。首先是提取数据传递的问题,按书上说的是把从数据库提取的内容放在一个数组中,传递给 smarty 模版,然后在模版中用 section 语句循环打印,但是始终没有成功。因为对 section 的语法不太理解。在循环打印时,如果按语法写 $article[line].id 就没有输出,我尝试改成 $article.id,这样编程循环打印其中某一个 id 的值很多遍,而不是把数据库中的每一个id值打印出来。
我反思了一下,出现这些问题的原因就是 smarty 的理解不够,只知其然而不知其所以然。 php 对我来说其实也是新事物,出现这些问题和对 php 中对数据库的 select 也有关。我的 php 的 select 返回的结果也不是很清楚,书上只教了怎么把结果用 while 循环打印,而没有说返回的结果怎么保存。我自己根据
<code>$result = mysql_query("SELECT * FROM article"); while($row = mysql_fetch_array($result)){ echo $row[id]; } </code>
这段代码,尝试把返回的结果放在一个数组中,像这样
<code>$result = mysql_query("SELECT * FROM article"); $row = mysql_fetch_array($result); $article = array('id' = $row[id], 'title' = $row[title]); </code>
然后把 $article 传递给 smarty,代码如下:
<code>$smarty->assign('article',$article); $smarty->display(index.tpl); </code>
但是在 index.tpl 中没有输出传过去的数据,所以我想是不是我的提取并传递数据库数据的方法有问题,因为不能深入理解,所以需要大家的帮忙了。我是一个新人,希望大家帮助我时能讲的详细一些,让我能理解内涵,做到知其然并知其所以然。
<code>$result = mysql_query("SELECT * FROM article"); while($row = mysql_fetch_array($result)){ $article = array('id' = $row[id], 'title' = $row[title]); } </code>

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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