此处，闭包函数在where参数中传递.要继承变量，您必须使用use关键字

Here, closure function passed in where argument. To inherit variables you have to use use keyword

例如function($q) use($var1, $var2, $var3){...

要了解有关闭包功能的更多信息，请查看php手册.

To learn more about closure function please check php manual.