php function does not define parameter method

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<?php
        function func()
        {
                 $numargs = func_num_args();//数组返回
                 echo "参数个数: $numargs\n";
                 $args = func_get_args();//获得参数的数组     
                 var_dump($args);//把数组打印出来
        }

         myfun(1, &#39;2&#39;);
	 echo &#39;<br>&#39;;
	 myfun(&#39;aa&#39;, 3.4, 5, 6, 7);
	 echo &#39;<br>&#39;;
	 myfun();
?>

Result:

78.5
113.04
Number of parameters: 2 array(2) { [0]=> int(1) [1]=> ; string(1) "2" }
Number of parameters: 5 array(5) { [0]=> string(2) "aa" [1]=> float(3.4 ) [2]=> int(5) [3]=> int(6) [4]=> int(7) }
Number of parameters: 0 array(0) { }

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