1、PHP's array_filter is an example of what is know in functional programming as a higher-order function.
2、In this case, the lambda function remains nameless: It is created inline as a parameter to the array_filter function.
1、PHP's array_filter is an example of what is know in functional programming as a higher-order function.
2、In this case, the lambda function remains nameless: It is created inline as a parameter to the array_filter function.