问题描述
我有一个很大的站点，每个页面都是由几个包含的文件构建的，我的站点是过程格式的100％，我正在尝试学习在PHP中使用类和更多的OOP方法.
I have a pretty large site and every page is built from several included files, my site is 100% in a procedural format and I am trying to learn to use classes and a more OOP approach in PHP.
当前，我的站点的头文件包含在每个页面中，该头是建立的mysql连接，持续到页面持续时间，因此，如果我需要从不同的文件运行10个不同的查询，则它们无需建立新连接即可运行，因此连接仅建立一次.
Currently my site has a header file that is included into every page, in this header is a mysql connection that is made and last the duration of the page, so if I need to run 10 different queries from different files, they all run without needing to make a new connection, so the connection is only made once.
现在，我正尝试转换为更多的OO方式，我首先要编写一个mysql类来连接和运行查询，所以我正在考虑使用__construct类来建立与mysql的连接，我只是奇怪的是，每次调用该类时，它将建立或尝试建立与mysql的连接，而不仅仅是一次.
Now that I am trying to convert to a more OO way, I am starting with writing a mysql class to connect and run queries, so I am thinking of using the classes __construct function to make a connection to mysql, I am just curious how this would work though, everytime that class gets called it would make or try to make a connection to mysql instead of just once.
也许我没有清楚地考虑.我应该只在标题中启动该类1次，然后再不必担心吗?
Maybe I am not thinking it out clearly. Should I just initiate this class in the header 1 time and then I wont have to worry anymore?
推荐答案
您可以创建MySQL类的单个全局对象，并在任何地方使用该对象.然后，您的构造函数将只被调用一次.
You could create a single global object of your MySQL class and use that object everywhere. Then your constructor would only be called once.
或者您可以在任何地方创建MySQL类的新对象.如果已经打开一个 mysql_connect 不会打开新连接:
Or you could create new objects of your MySQL class everywhere. mysql_connect doesn't open new connections if there already is one open:
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