What is the function func_num_args() used for?

The function func_num_args() is used to retrieve the number of arguments passed to a function in PHP. It is often used in conjunction with other functions like func_get_arg() and func_get_args() to create flexible and dynamic functions that can handle a variable number of arguments. For example, you can use func_num_args() inside a function to determine how many arguments were passed to it and then iterate over the arguments using a loop with func_get_arg() to process each argument individually. The func_num_args() function provides a convenient way to create generic functions that can adapt to different input parameters. It's important to note that func_num_args() can only be used within a user-defined function and not outside of it.