Call_user_func function and call_user_func_array function parsing _ PHP Tutorial

Call_user_func and call_user_func_array functions are parsed. Today, by accident, I again saw the call_user_func_array () function in php in the official CodeIgniter document. I also encountered this function in the discuz Forum code last year, today, by chance on the Internet, I again saw the call_user_func_array () function in php in the official CodeIgniter document. I also encountered this function in the discuz Forum code last year, I checked the usage of this function on the Internet today. I would like to share with you the usage of this call_user_func_array and call_user_func functions. In addition, I will provide the usage instructions for func_get_args () and func_num_args () functions.

Call_user_func is used when a function needs to be called dynamically. this function has two usage methods, which are described below:

(1) call the lonely function:

(2) call internal functions of the class:

In the preceding example, the result is as follows:

Array
(
[0] = & gt; 111
[1] => 222.
)
2

Tip: The func_get_args () function is used to obtain the parameters passed in to the function. an array is returned. the func_num_args () function gets the number of parameters in the input function.

Next let's take a look at call_user_func_array. This function is also used when a function needs to be called dynamically. its usage is similar to that of the call_user_func function, but the parameter is passed in an array. The example is as follows:

The call_user_func_array function can also call internal methods of the class, such:

The following is an example of dynamic function call:

The readers of the above examples can be more impressed when they can run them on their own.

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The Destroy () function was also encountered in the discuz Forum code last year. Today, it is on the internet...