If we are defining a php function and are not sure how many parameters need to be input, what should we do? In this case, we need to use the func_num_args, func_get_args, and func_get_arg system functions to help us define a php function. if we are not sure how many parameters need to be input, what should we do? In this case, we need to use the func_num_args, func_get_args, and func_get_arg system functions to help.
Let's take a look at what these three functions are:
1. func_num_args (): returns the number of real parameters that you input when calling a function.
2. func_get_arg (): returns the number of real parameters that you input when calling a function.
3. func_get_args (): an array of parameters that are input when you call a function.
Let's look at an example:
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