Function processing function in php

* Function processing function

* 1. Parameter acquisition: it must be called in a function to be meaningful

* 1.get_num_args(void): Return the number of parameters

* 2.get_get_args(): Returns the parameter value index array

* 3.get_get_arg(int): Returns the parameter value of the specified index

function demo1($a,$b,$c)
{
    //返回实际参数组成的索引数组
//    return func_get_args();//无参数,[0]=>php,[1]=>java,[2]=>c
//    return func_get_arg(1); //参数为实参索引,获取第2个参数值:java
    return func_num_args();//无参数,返回参数数量:3
}
print_r(demo1('php','java','c'));

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