ThinkPHP
一般而言,网页传统方式的导入外部JS和CSS等资源文件的方法是直接在模板文件使用:
<script type='text/javascript' src='/Public/Js/Util/Array.js'> <link rel="stylesheet" type="text/css" href="/App/Tpl/default/Public/css/style.css" />
ThinkPHP的模板引擎提供了专门的标签来简化上面的导入。
1.import标签
第一个是import标签 ,导入方式采用类似ThinkPHP的import函数的命名空间方式,例如:
<import type='js' file="Js.Util.Array" />
Type属性默认是js, 所以下面的效果是相同的:
<import file="Js.Util.Array" />
还可以支持多个文件批量导入,例如:
<import file="Js.Util.Array,Js.Util.Date" />
导入外部CSS文件必须指定type属性的值,例如:
<import type='css' file="Css.common" />
上面的方式默认的import的起始路径是网站根目录下的Public目录,如果需要指定其他的目录,可以使用basepath属性,例如:
<import file="Js.Util.Array" basepath="./Common" />
如果导入的文件中含有“.”号,则可以采用:
<import file="Js.Util.Array#min" />
表示导入 /Public/Js/Util/Array.min.js 资源文件。
还支持资源文件的版本号导入,例如:
<import type='js' file="Js.Util.Array?v=120" />
在导入多个文件的时候也可以支持
<import type='js' file="Js.Util.Array?125,Js.Util.Date?130" />
improt标签支持判断加载,例如下面首先判断name变量是否设置:
<import type='js' file="Js.Util.Array" value="name" />
或者更复杂的,甚至可以采用函数:
<import type='js' file="Js.Util.Array" value="Think.get.name|isset" />
编译后的模板缓存是:
<?php if(isset($_GET['name'])): ?> <script type="text/javascript" src="/Public/Js/Util/Array.js"></script> <?php endif; ?>
2.load标签
第二个是load标签,通过URL方式导入当前项目的公共JS或者CSS,例如:
<load href="/Public/Js/Common.js" /> <load href="/Public/Js/Date.js?v=235" /> <load href="/Public/Css/common.css" />
在href属性中可以使用特殊模板标签替换,例如:
<load href="!-PUBLIC-!/Js/Common.js" />
Load标签无需指定type属性,系统会自动根据后缀自动判断。
当然,load标签也支持条件判断调用:
<load href="/Public/Js/Common.js" value="name" />
系统还提供了两个标签别名js和css 用法和load一致,例如:
<js href="/Public/Js/Common.js" /> <css href="/Public/Css/common.css" />
load标签也支持同时导入多个资源文件,甚至是不同类型的资源文件:
<load href="/Public/Js/Common.js,/Public/Css/common.css" />

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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