blocks|key|264085|text|我一直在使用数据库类。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|264086|这里有几个例子：|264087|http://www.massless.org/_tests/phpdb/|offset|length|264088|http://slaout.linux62.org/php/index.html|264089|http://www.tonymarston.net/php-mysql/databaseobjects.html|264090|entityMap|0|LINK|mutability|MUTABLE|url|1|2^0|0|0|0|11|0|0|0|14|1|0|0|1L|2|0^^$0|@$1|2|3|4|5|6|7|U|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|V|8|@]|9|@]|A|$]]|$1|D|3|E|5|6|7|W|8|@]|9|@$F|X|G|Y|1|Z]]|A|$]]|$1|H|3|I|5|6|7|10|8|@]|9|@$F|11|G|12|1|13]]|A|$]]|$1|J|3|K|5|6|7|14|8|@]|9|@$F|15|G|16|1|17]]|A|$]]|$1|L|3|-4|5|6|7|18|8|@]|9|@]|A|$]]]|M|$N|$5|O|P|Q|A|$R|E]]|S|$5|O|P|Q|A|$R|I]]|T|$5|O|P|Q|A|$R|K]]]]

I use a database class all the time. 

Here are a couple examples:

<a href="http://www.massless.org/_tests/phpdb/" rel="nofollow noreferrer">http://www.massless.org/_tests/phpdb/</a>

<a href="http://slaout.linux62.org/php/index.html" rel="nofollow noreferrer">http://slaout.linux62.org/php/index.html</a>

<a href="http://www.tonymarston.net/php-mysql/databaseobjects.html" rel="nofollow noreferrer">http://www.tonymarston.net/php-mysql/databaseobjects.html</a>

blocks|key|4328081|text|阅读别人的代码，看看他们是如何把东西分成类的，这真的是个好主意。看看一些PEAR模块或框架(+Zend、Symfony、蛋糕)。|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|4328082|entityMap|0|LINK|mutability|MUTABLE|url|http://pear.php.net/|1|http://framework.zend.com/|2|http://www.symfony-project.org/^0|10|4|0|1B|4|1|1G|7|2|0^^$0|@$1|2|3|4|5|6|7|P|8|@]|9|@$A|Q|B|R|1|S]|$A|T|B|U|1|V]|$A|W|B|X|1|Y]]|C|$]]|$1|D|3|-4|5|6|7|Z|8|@]|9|@]|C|$]]]|E|$F|$5|G|H|I|C|$J|K]]|L|$5|G|H|I|C|$J|M]]|N|$5|G|H|I|C|$J|O]]]]

It's a really good idea to read other people's code and see how they have separated things into classes. Look at some <a href="http://pear.php.net" rel="nofollow noreferrer">PEAR</a> modules or a framework ( <a href="http://framework.zend.com" rel="nofollow noreferrer">Zend</a>, <a href="http://www.symfony-project.org" rel="nofollow noreferrer">Symfony</a>, Cake ).

blocks|key|4328164|text|任何时候你可以定义一个“做东西”的东西，你就有了一个定义对象的候选对象。来自PHP标准库的两个具体示例立即出现在脑海中：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|4328165|4328166|许多数据库模块使用对象进行连接、查询和结果。|unordered-list-item|4328167|+DateTime类封装了一个通用的时间概念，包括输入和输出格式、时区转换和日期算法。|4328168|4328169|问题是，面向对象编程是一个伟大的想法--你可以用面向对象的方式解决几乎任何编程问题。|4328170|entityMap^0|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|N|8|@]|9|@]|A|$]]|$1|C|3|D|5|E|7|O|8|@]|9|@]|A|$]]|$1|F|3|G|5|E|7|P|8|@]|9|@]|A|$]]|$1|H|3|-4|5|6|7|Q|8|@]|9|@]|A|$]]|$1|I|3|J|5|6|7|R|8|@]|9|@]|A|$]]|$1|K|3|-4|5|6|7|S|8|@]|9|@]|A|$]]]|L|$]]

Any time you can define a 'thing' that 'does stuff', you've got a candidate for defining an object. Two concrete examples, from the PHP standard library, that immediately pop to mind are :

<ul>
<li>Numerous database modules use objects for connections, queries &amp; results.</li>
<li>The DateTime class encapsulates a generic concept of time with input &amp; output formatting, timezone conversions &amp; date arithmetic.</li>
</ul>

The thing is, Object Oriented Programming is a big idea - you can solve almost any programming problem in an object oriented way.

blocks|key|4327998|text|我构建了一个实用程序类，它使mail()函数的使用人性化，我经常使用这个函数。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|4327999|entityMap|0|LINK|mutability|MUTABLE|url|http://php.net/manual/en/function.mail.php^0|E|6|E|6|0|0^^$0|@$1|2|3|4|5|6|7|N|8|@$9|O|A|P|B|C]]|D|@$9|Q|A|R|1|S]]|E|$]]|$1|F|3|-4|5|6|7|T|8|@]|D|@]|E|$]]]|G|$H|$5|I|J|K|E|$L|M]]]]

I've built an utility class that humanizes the use of the <a href="http://php.net/manual/en/function.mail.php" rel="nofollow noreferrer"><code>mail()</code></a> function, which I tend to use quite a lot.

blocks|key|4328111|text|通过使用类(例如，上面提到的PEAR包等)，您能够利用已经编写和测试的代码来执行常见任务。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|4328112|也可以帮助你避免重复发明轮子。|4328113|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|F|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|G|8|@]|9|@]|A|$]]|$1|D|3|-4|5|6|7|H|8|@]|9|@]|A|$]]]|E|$]]

By using classes (e.g. PEAR packages mentioned above, others), you are able to leverage code that has already been written and tested to perform common tasks.

Helps you to not reinvent the wheel, too.

blocks|key|264388|text|我强烈建议您学习设计模式。他们中的许多人很好地利用了类并解决了常见的编程问题。特别是，工厂和抽象工厂模式是一个很好的起点。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|264389|还有一本名为PHP+Hacks的优秀书籍，其中有一章介绍了用PHP语言实现一系列不同的模式，所以你可能想看看这本书。|offset|length|264390|另外，探索PHP中的一些内置对象，看看它们是如何工作的，并获得更多的想法：|264391|264392|PDO|unordered-list-item|264393|ArrayObject|264394|SimpleXMLElement|264395|DirectoryIterator|264396|264397|1:+http://en.wikipedia.org/wiki/Design_pattern_(computer_science)(http://en.wikipedia.org/wiki/Design(computer_science%2529)"design+patterns"|264398|entityMap|0|LINK|mutability|MUTABLE|url|http://oreilly.com/catalog/9780596101398/|1|http://en.wikipedia.org/wiki/Design_pattern_(computer_science%2529)^0|0|6|9|0|0|0|0|0|0|0|0|0|1U|1R|1|0^^$0|@$1|2|3|4|5|6|7|14|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|15|8|@]|9|@$D|16|E|17|1|18]]|A|$]]|$1|F|3|G|5|6|7|19|8|@]|9|@]|A|$]]|$1|H|3|-4|5|6|7|1A|8|@]|9|@]|A|$]]|$1|I|3|J|5|K|7|1B|8|@]|9|@]|A|$]]|$1|L|3|M|5|K|7|1C|8|@]|9|@]|A|$]]|$1|N|3|O|5|K|7|1D|8|@]|9|@]|A|$]]|$1|P|3|Q|5|K|7|1E|8|@]|9|@]|A|$]]|$1|R|3|-4|5|6|7|1F|8|@]|9|@]|A|$]]|$1|S|3|T|5|6|7|1G|8|@]|9|@$D|1H|E|1I|1|1J]]|A|$]]|$1|U|3|-4|5|6|7|1K|8|@]|9|@]|A|$]]]|V|$W|$5|X|Y|Z|A|$10|11]]|12|$5|X|Y|Z|A|$10|13]]]]

I would highly recommend learning about [design patterns][1]. Many of them make good use of classes and solve common programming problems. In particular the Factory and Abstract Factory patterns are a good place to start.

There is also an excellent book called <a href="http://oreilly.com/catalog/9780596101398/" rel="nofollow noreferrer">PHP Hacks</a> that has a chapter about implementing a host of different patterns in PHP, so you might want to check that out.

Also, explore some of these built-in objects in PHP to see how they work and get more ideas:

<ul>
<li>PDO</li>
<li>ArrayObject</li>
<li>SimpleXMLElement</li>
<li>DirectoryIterator

[1]: <a href="http://en.wikipedia.org/wiki/Design_pattern_(computer_science)" rel="nofollow noreferrer">http://en.wikipedia.org/wiki/Design_pattern_(computer_science)</a>"design patterns"</li>
</ul>

blocks|key|4328242|text|type|unstyled|depth|inlineStyleRanges|entityRanges|data|4328243|我创建了一个user类来在我的web应用程序中执行与用户相关的各种任务，例如输出头像、显示消息数量等。|blockquote|4328244|4328245|4328246|查看http://en.wikipedia.org/wiki/Cohesion_(computer_science)|offset|length|4328247|您的示例听起来像是逻辑内聚。|4328248|目标是函数式内聚。每个类执行特定的任务，并尽可能将类作为泛型，您会发现可以反复重用它们。|style|BOLD|4328249|Symfony的sfParameterHolder就是一个很好的例子：|4328250|http://www.symfony-project.org/book/1_2/02-Exploring-Symfony-s-Code#chapter_02_sub_parameter_holders|4328251|Symfony使用它来保存视图模板的变量(在MVC中)，在web请求对象中存储请求参数(本身是一个类，它代表所有的请求参数，尽职尽责地剥离反斜杠等)，在sfUser类中存储所有最终进入$_SESSION的参数等。|4328252|下载symfony的“沙箱”，进入/lib/symfony/文件夹并从中学习。它很复杂，但是代码非常干净。|4328253|http://www.symfony-project.org/installation|4328254|Zend也不错，但是包含文件的数量可能太多了，我个人不喜欢他们的命名约定，特别是使用下划线前缀。|4328255|entityMap|0|LINK|mutability|MUTABLE|url|http://en.wikipedia.org/wiki/Cohesion_(computer_science)|1|2^0|0|0|0|0|2|1K|0|0|0|S|2|0|0|0|2S|1|0|0|0|0|17|2|0|0^^$0|@$1|2|3|-4|4|5|6|1B|7|@]|8|@]|9|$]]|$1|A|3|B|4|C|6|1C|7|@]|8|@]|9|$]]|$1|D|3|-4|4|5|6|1D|7|@]|8|@]|9|$]]|$1|E|3|-4|4|5|6|1E|7|@]|8|@]|9|$]]|$1|F|3|G|4|5|6|1F|7|@]|8|@$H|1G|I|1H|1|1I]]|9|$]]|$1|J|3|K|4|5|6|1J|7|@]|8|@]|9|$]]|$1|L|3|M|4|5|6|1K|7|@$H|1L|I|1M|N|O]]|8|@]|9|$]]|$1|P|3|Q|4|5|6|1N|7|@]|8|@]|9|$]]|$1|R|3|S|4|5|6|1O|7|@]|8|@$H|1P|I|1Q|1|1R]]|9|$]]|$1|T|3|U|4|5|6|1S|7|@]|8|@]|9|$]]|$1|V|3|W|4|5|6|1T|7|@]|8|@]|9|$]]|$1|X|3|Y|4|5|6|1U|7|@]|8|@$H|1V|I|1W|1|1X]]|9|$]]|$1|Z|3|10|4|5|6|1Y|7|@]|8|@]|9|$]]|$1|11|3|-4|4|5|6|1Z|7|@]|8|@]|9|$]]]|12|$13|$4|14|15|16|9|$17|18]]|19|$4|14|15|16|9|$17|S]]|1A|$4|14|15|16|9|$17|Y]]]]

<blockquote>
 I created a user class to preform various tasks relating to users in my web application such as output the avatar, show number of messages ect.
</blockquote>

Check out <a href="http://en.wikipedia.org/wiki/Cohesion_(computer_science)" rel="nofollow noreferrer">http://en.wikipedia.org/wiki/Cohesion_(computer_science)</a>

Your example sounds like Logical cohesion.

Aim for functional cohesion. Each class does a particular task, and make classes as generic as possible and you'll find you can reuse them over and over.

A great example of that, is Symfony's sfParameterHolder:

<a href="http://www.symfony-project.org/book/1_2/02-Exploring-Symfony-s-Code#chapter_02_sub_parameter_holders" rel="nofollow noreferrer">http://www.symfony-project.org/book/1_2/02-Exploring-Symfony-s-Code#chapter_02_sub_parameter_holders</a>

Symfony uses it to hold variables for view templates (in a MVC), to store request parameters in the web request object (itself a class that represents all request parameters dutifully stripped of backslashes etc), in the sfUser class to store all the parameters that eventually go in the $_SESSION etc etc.

Download Symfony's "sandbox", go into the /lib/symfony/ folder and learn from it. It"s complex but the code imho is very clean.

<a href="http://www.symfony-project.org/installation" rel="nofollow noreferrer">http://www.symfony-project.org/installation</a>

Zend is nice too, but the number of include files mayb be overwhelming and I am personally not fond of their naming conventions, in particular using underscore prefixes.

I have learned how to use classes in PHP and so far I have only really found one useful application for them. I created a user class to preform various tasks relating to users in my web application such as output the avatar, show number of messages ect.

Aside from this example, what are some other useful ways to utilize classes in a practical sense?

What are some useful ways to utilize classes in PHP?

翻译质量差，导致语言生硬或混乱。

没有提供实际的解决方法或示例。

解答不清晰，无法理解或解决问题。

页面排版不美观，阅读体验差。

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我已经学会了如何在PHP中使用类，到目前为止，我只找到了一个适用于它们的实用应用程序。我创建了一个user类来在我的web应用程序中执行与用户相关的各种任务，例如输出头像、显示消息数量等。除了这个例子之外，在实际意义上还有其他一些有用的方法来利用类吗？

问在PHP中利用类有哪些有用的方法？
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问在PHP中利用类有哪些有用的方法？EN

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