For example, if you use a third-party library, such as those made available by PHP Extension and Application Repository (PEAR), you will find yourself instantiating objects and calling methods.
例如，如果使用第三方库，比如通过PHP Extension and Application Repository (PEAR)可以使用的库，您将发现自己在实例化对象和调用方法。
Instantiating data pool objects in a test.
在测试中实例化数据池对象。
Some of the processing requires getting information from objects. If this information can be acquired directly from the database server, we can avoid instantiating them.
某些处理需要从对象获取信息，如果该信息可以直接从数据库服务器获得，我们就可以避免实例化它们。
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