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Professional LAMP Linux Apache, MySQL and PHP5 Web Development phần 3

Javax.security.auth.Refreshable này rất hữu dụng cho chứng chỉ đòi hỏi một sự làm mới của nhà nước của Bộ (có lẽ giấy chứng nhận chỉ có giá trị cho một chiều dài thời gian cụ thể). Bốn phương pháp này được xác định trên giao diện này. các | Chapter 3 matrix array array 1 2 array 3 4 temp matrix array_push null temp transposed_matrix call_user_func_array array_map temp The first argument to array_map is the name of the callback function so make the first argument of temp that callback in this case a null callback . This is why I needed the temp variable array_push modifies the original array rather than returning a copy. I could have lived dangerously by using transposed_matrix itself instead of temp and saved myself the variable and the final unset . Dangerous because it would have reduced the readability of the code slightly creating the variable as one thing the list arguments to array_map and two lines later using it for something quite different the result of the array_map call . temp array null array 1 2 array 3 4 transposed_matrix call_user_func_array array_map temp Here s the result of carrying out call_user_func_array by hand. transposed_matrix array_map null array 1 2 array 3 4 So one way to look at the operation of call_user_func foo array arguments is to look on it as taking an array and replacing array arguments with foo arguments . To complete the example evaluate the array_map call transposed_matrix array array 1 3 array 2 4 The practical upshot of call_user_func_array is that you can store all of the arguments to a function in a single array without needing to know how many arguments there are consider that several PHP functions accept variable numbers of arguments and so can yours nor needing to take each of the elements out of the array and inserting them into the function call by hand. The reason for the slightly long-winded name is that there is also a call_user_func function. Instead of taking a callback and its arguments as an array it takes the callback and its arguments explicitly. Just as you can think of PHP as converting call_user_func_array foo array arguments to foo arguments call_user_func foo arguments converts to foo arguments without using the intermediate array. It may