You can test for them explicitly or rely on PHP to return a default empty value when you reference them.
您可以显式地对它们进行检测，或在您引用它们时让PHP返回缺省的空值。
As the default rate for informal lending vehicles rises, deposits may return to the Banks.
随着非正规贷款公司违约率的提高，存款可能会回流至中资银行。
Fifth is not your default, though many may choose to return to Third later to serve as a Gatekeeper.
第五维才是你不能缺席的，很多们回到第三维度之后会做守门人的服务。
Return to the Default Messaging Provider dialog and select JMS activation specification => New.
返回到DefaultMessagingProvider对话框并选择JMSactivationspecification =>New。
The default option in boto is to return one message.
boto中的默认设置是返回一个消息。
In our example, we use a: default implementation to specify that all unlisted nodes should return themselves without modification.
在我们的示例中，我们使用：default实现来指定所有未加入列表的节点都应无修改地返回自身。
To return the default value of true click Complete.
若要返回缺省值true，请单击Complete。
For example, their decision to return totals by default.
比如说，默认情况下返回总数的决定。
Programs will be able to use the variable to either return search results with popular tweets at the top as default, show only popular results or show only recent results.
在搜索时，其他程序可以利用这个变量实现在顶端显示热门推文、只显示热门推文，或者只显示最近推文。
When all updates are complete, return the default PXE boot configuration to boot from local disk to avoid any accidents if a computer were to make a PXE request.
更新完成后，把默认PXE启动配置改为从本地磁盘启动，防止计算机再次发出PXE请求时发生意外。
This URL will return 30 articles as opposed to the default of 10.
该URL将返回30篇文章，而不是默认的10篇。
Either close your test plan or simply click the Home TAB to return to the default dashboard.
要么关闭您的测试计划，要么简单的点击home项以返回至默认的指示板。
For example, if a result row is larger than 32k bytes and the setting for rqrioblk is also at 32k (the default), each row will take two blocks to return.
例如，如果返回的行大于32k字节，并且rqrioblk也设置在32 k字节(默认情况)，那么每一行将分两个块返回。
By default, the driver IRQ routine should return IRQ_HANDLED as it is a bug to return IRQ_NONE when the driver has actually handled that interrupt.
缺省情况下，驱动程序IR Q例程应该返回IRQ_HANDLED，当驱动程序正在处理那个中断时却返回了IRQ_NONE，说明存在bug。
So, I'm going to implement the index method on Play's Application class (which is invoked by default if you hit the root path) to quickly return some text.
因此，我还要在Play的application类(在浏览器命中根路径时默认调用)上实现index方法以快速返回一些文本。
Last time, you allowed the Web service to return XML by default.
上一次，您允许Web服务默认地返回XML。
In earlier versions, it changes the return value of the generated function in_word_set from its default Boolean value (that is, 0 or 1) to the pointer to wordlist array type.
在早期版本中，它将生成的函数in _ word_set返回的默认布尔值(即0或1)修改为pointerto wordlist array类型。
If a user attempts to directly access a protected page without first logging in (for example, by using a bookmark or following a link), the WebSEAL server will return its default login page.
如果用户试图不是先登录而是直接访问受保护的页面(例如，采用书签或者利用链接)，WebSEAL服务器将会返回其默认登录页面。
You may specify the total number of tagged entries to return using the n parameter -- the default value is 20 (n=20).
你可以通过参数n指定返回的数量，默认为20。
You return to the default view of the Monitoring portlet, with a message reporting the successful addition of the graph. Select the added graph to display the graph, as Figure 32 shows.
您将返回到MonitoringPortlet的缺省视图，并有一条消息报告该图表已成功添加。
Return to the Default Messaging Provider window in the admin console (Figure 2), and select JMS activation specification, then New.
返回管理控制台的DefaultMessagingProvider窗口（图2），选择JMSactivationspecification，然后选择New。
Click the Restore Default view button to return to the full view.
点击恢复默认视图按钮返回全景视图。
This updates the Description pane to display related symbols, such as the parent object, parameter and return types, and default constant values.
此时会相应地更新“说明”窗格以显示相关的符号(如父对象、参数和返回类型)以及默认常量值。
How to return dropdown menu to the default option based upon another menu?
如何返回到另一个菜单的下拉菜单的默认选项？
SqlTrackingService will return the default tracking profile to the workflow runtime engine for any workflow type for which it doesn't have a tracking profile associated in its database.
当工作流程执行阶段引擎为追踪服务没有关联追踪设定档的工作流程类型要求设定档时，将传回这个新的预设设定档。
The default behavior is to return the passed token reference unchanged to the caller.
缺省的行为是返回未经修改的单词引用。
This internal default value causes the wrapped control to return its own default value of 19.
这个内部预设值会使得包装的控制项传回它自己的预设值19。
This internal default value causes the wrapped control to return its own default value of 19.
这个内部预设值会使得包装的控制项传回它自己的预设值19。
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