The function, preg_grep , makes processing a list very easy: Simply provide the pattern as the first argument and an array of words to match as the second argument.
使用函数preg_grep可以非常轻松地处理列表：只需提供模式作为第一个参数，并提供要匹配的单词数组作为第二个参数。
The ContactListBroker interface (Listing 3) defines the function that our application needs for Contact list processing.
ContactListBroker接口(清单3)定义了应用程序处理联系人列表所需的函数。
For example, if the expression doesn't use the last function then it is not necessary to do look-ahead processing to determine how many elements there are in the context list.
例如，如果表达式不使用last函数，那么就不必执行先行处理来确定上下文列表中有多少元素。
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