Second question about PHP

最新推荐文章于 2025-08-06 16:23:50 发布

原创最新推荐文章于 2025-08-06 16:23:50 发布 · 445 阅读

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#dao #class #layer #java #php #c

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本文探讨了在PHP项目中遇到的问题：当两个不同的数据访问对象（DAO）文件各自包含对同一数据库连接类的引用时，如何避免重复声明类错误。讨论了PHP与Java在类加载机制上的区别。

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Today, I find a bewildering and fallacious point.

A class ,named a_dao.class.php, in DAO layer has codes as "require("./DBConnection.class.php")", and another one ,named b_dao.class.php, in DAO layer also has.

When I use both them as defined in another class "require("./dao/a_dao.class.php");require("./dao/b_dao.class.php")", it will say "Fatal error: Cannot redeclare class DBConnection inC:/Program Files/Apache Software Foundation/Apache2.2/htdocs/application/dao/DBConnection.class.php on line3".

I think this will take troubles to use, as we cann't require a class twice or more.

Why doesn't it require a class only once automatically like Java ?