YII如何调用第三方PHP类
首先要了解Root Alias
为方便起见,Yii 预定义了以下几个根别名:
system: 表示 Yii 框架目录;
zii: 表示 Zii 库 目录;
application: 表示应用的 基础目录;
webroot: 表示 入口脚本 文件所在的目录。此别名从版本 1.0.3 开始有效。
ext: 表示包含了所有第三方 扩展 的目录。此别名从版本 1.0.8 开始有效。
* 导入Class
使用别名可以很方便的导入类的定义。例如,如果我们想包含 CController 类的定义,我们可以调用如下代码
Yii::import('system.web.CController');
import 方法跟 include 和 require 不同,它更加高效。导入(import)的类定义并不会真正被包含进来,直到它第一次被引用。多次导入同样的名字空间也会比 include_once 和 require_once 快得多。
提示: 当引用 Yii 框架定义的类时,我们不需要导入或包含它。所有的核心 Yii 类都已被提前导入了。
* 引用第三库
第一,比如说,我们要使用 Zend framework的东西。我们把zend framework解压到 prtected/vendors里面,现在的文件夹为 protected/vendors/Zend/Search/Lucene.php
第二,在controller文件的头部,插入下面代码。
Yii::import('application.vendors.*'); // 可以配置在config/main.php中
require once('Zend/Search/Lucene.php');
上面代码包含了Lucene.php这个类文件。因为我们用到的是相对路径,所以我们需要改变PHP加载文件的路径,Yii::import 一定要在require_once 之前。


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PHP and Python are both high-level programming languages that are widely used in web development, data processing and automation tasks. 1.PHP is often used to build dynamic websites and content management systems, while Python is often used to build web frameworks and data science. 2.PHP uses echo to output content, Python uses print. 3. Both support object-oriented programming, but the syntax and keywords are different. 4. PHP supports weak type conversion, while Python is more stringent. 5. PHP performance optimization includes using OPcache and asynchronous programming, while Python uses cProfile and asynchronous programming.

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PHP type prompts to improve code quality and readability. 1) Scalar type tips: Since PHP7.0, basic data types are allowed to be specified in function parameters, such as int, float, etc. 2) Return type prompt: Ensure the consistency of the function return value type. 3) Union type prompt: Since PHP8.0, multiple types are allowed to be specified in function parameters or return values. 4) Nullable type prompt: Allows to include null values and handle functions that may return null values.


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