Home Backend Development PHP Tutorial 种里引用另一个类里的方法,怎以不行

种里引用另一个类里的方法,怎以不行

Jun 13, 2016 am 11:07 AM
config eclipse nbsp php

类里引用另一个类里的方法,怎以不行

本帖最后由 xiachao2008 于 2011-12-16 15:34:37 编辑 有一个数据库类 sql.php
有一个配置文件config.php,里面new了数据连接类得到类名$db
在一个操作文件aa.php里面引入config.php

在aa.php里,定主了一个类名Aa 我在Aa里要用数据库类sql.php里的一个方法,但是eclipse不提示方法(很明显引用不成功)
但是,我在Aa类的外面引用方法      eclipse提示了方法


这个为什么呢,难到在一个类里的方法不能引用另一个类的方法?


------解决方案--------------------
可以!
你可以在外部实例化,作为参数传递到类中
你可以在外部实例化,在类中声明全局变量
你可以在类中实例化
你还可以通过累的静态属性传递进来
你还可以采用单例模式使用它

------解决方案--------------------
引用:
有一个数据库类 sql.php
有一个配置文件config.php,里面new了数据连接类得到类名$db
在一个操作文件aa.php里面引入config.php

在aa.php里,定主了一个类名Aa 我在Aa里要用数据库类sql.php里的一个方法,但是eclipse不提示方法(很明显引用不成功) 但是,我在Aa类的外面引用方法      eclipse提示了方法


这个为什么……


如果运行有错的话,你还是吧代码贴出来看看。
------解决方案--------------------
引用:
config.php里我实例化了$db
我在aa.php引用了config.php
按上面所说的,我在Aa类里直接
$db->方法
就可以啊。
但是,实际上是不行的。

为什么可以呢?那个 $db 对于 Aa 的方法来说是外部变量,你不拿进来怎么能用呢?
------解决方案--------------------
那就要怪 eclipse 了,他居然不能识别运行时刻加载的对象!?
真该千刀万剐
------解决方案--------------------
后面我在Aa类的一个方法里引入config.php文件
但是还是不能用啊?

在该方法中应该可以用了,其他方法不可以用。
------解决方案--------------------
引用:
后面我在Aa类的一个方法里引入config.php文件
但是还是不能用啊?

在该方法中应该可以用了,其他方法不可以用。


? 你是xxx的马甲? xxx是你的马甲?


------解决方案--------------------
很神奇啊。

引用:
引用:

后面我在Aa类的一个方法里引入config.php文件
但是还是不能用啊?

在该方法中应该可以用了,其他方法不可以用。


? 你是xxx的马甲? xxx是你的马甲?
Statement of this Website
The content of this article is voluntarily contributed by netizens, and the copyright belongs to the original author. This site does not assume corresponding legal responsibility. If you find any content suspected of plagiarism or infringement, please contact admin@php.cn

Hot AI Tools

Undresser.AI Undress

Undresser.AI Undress

AI-powered app for creating realistic nude photos

AI Clothes Remover

AI Clothes Remover

Online AI tool for removing clothes from photos.

Undress AI Tool

Undress AI Tool

Undress images for free

Clothoff.io

Clothoff.io

AI clothes remover

Video Face Swap

Video Face Swap

Swap faces in any video effortlessly with our completely free AI face swap tool!

Hot Article

Roblox: Bubble Gum Simulator Infinity - How To Get And Use Royal Keys
3 weeks ago By 尊渡假赌尊渡假赌尊渡假赌
Nordhold: Fusion System, Explained
3 weeks ago By 尊渡假赌尊渡假赌尊渡假赌
Mandragora: Whispers Of The Witch Tree - How To Unlock The Grappling Hook
3 weeks ago By 尊渡假赌尊渡假赌尊渡假赌

Hot Tools

Notepad++7.3.1

Notepad++7.3.1

Easy-to-use and free code editor

SublimeText3 Chinese version

SublimeText3 Chinese version

Chinese version, very easy to use

Zend Studio 13.0.1

Zend Studio 13.0.1

Powerful PHP integrated development environment

Dreamweaver CS6

Dreamweaver CS6

Visual web development tools

SublimeText3 Mac version

SublimeText3 Mac version

God-level code editing software (SublimeText3)

Hot Topics

Java Tutorial
1665
14
PHP Tutorial
1269
29
C# Tutorial
1249
24
PHP and Python: Comparing Two Popular Programming Languages PHP and Python: Comparing Two Popular Programming Languages Apr 14, 2025 am 12:13 AM

PHP and Python each have their own advantages, and choose according to project requirements. 1.PHP is suitable for web development, especially for rapid development and maintenance of websites. 2. Python is suitable for data science, machine learning and artificial intelligence, with concise syntax and suitable for beginners.

PHP in Action: Real-World Examples and Applications PHP in Action: Real-World Examples and Applications Apr 14, 2025 am 12:19 AM

PHP is widely used in e-commerce, content management systems and API development. 1) E-commerce: used for shopping cart function and payment processing. 2) Content management system: used for dynamic content generation and user management. 3) API development: used for RESTful API development and API security. Through performance optimization and best practices, the efficiency and maintainability of PHP applications are improved.

PHP: A Key Language for Web Development PHP: A Key Language for Web Development Apr 13, 2025 am 12:08 AM

PHP is a scripting language widely used on the server side, especially suitable for web development. 1.PHP can embed HTML, process HTTP requests and responses, and supports a variety of databases. 2.PHP is used to generate dynamic web content, process form data, access databases, etc., with strong community support and open source resources. 3. PHP is an interpreted language, and the execution process includes lexical analysis, grammatical analysis, compilation and execution. 4.PHP can be combined with MySQL for advanced applications such as user registration systems. 5. When debugging PHP, you can use functions such as error_reporting() and var_dump(). 6. Optimize PHP code to use caching mechanisms, optimize database queries and use built-in functions. 7

The Enduring Relevance of PHP: Is It Still Alive? The Enduring Relevance of PHP: Is It Still Alive? Apr 14, 2025 am 12:12 AM

PHP is still dynamic and still occupies an important position in the field of modern programming. 1) PHP's simplicity and powerful community support make it widely used in web development; 2) Its flexibility and stability make it outstanding in handling web forms, database operations and file processing; 3) PHP is constantly evolving and optimizing, suitable for beginners and experienced developers.

PHP vs. Python: Understanding the Differences PHP vs. Python: Understanding the Differences Apr 11, 2025 am 12:15 AM

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 and Python: Code Examples and Comparison PHP and Python: Code Examples and Comparison Apr 15, 2025 am 12:07 AM

PHP and Python have their own advantages and disadvantages, and the choice depends on project needs and personal preferences. 1.PHP is suitable for rapid development and maintenance of large-scale web applications. 2. Python dominates the field of data science and machine learning.

PHP vs. Other Languages: A Comparison PHP vs. Other Languages: A Comparison Apr 13, 2025 am 12:19 AM

PHP is suitable for web development, especially in rapid development and processing dynamic content, but is not good at data science and enterprise-level applications. Compared with Python, PHP has more advantages in web development, but is not as good as Python in the field of data science; compared with Java, PHP performs worse in enterprise-level applications, but is more flexible in web development; compared with JavaScript, PHP is more concise in back-end development, but is not as good as JavaScript in front-end development.

PHP and Python: Different Paradigms Explained PHP and Python: Different Paradigms Explained Apr 18, 2025 am 12:26 AM

PHP is mainly procedural programming, but also supports object-oriented programming (OOP); Python supports a variety of paradigms, including OOP, functional and procedural programming. PHP is suitable for web development, and Python is suitable for a variety of applications such as data analysis and machine learning.

See all articles