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                ## 第一種實現方式 * func_num_args() : 返回參數數量 . * func_get_arg() : 返回指定下標的參數 . * func_get_args() :返回包括參數列表的數組 . ### 實例 ~~~ function show($a,$b,$c){ echo '<pre>'; var_dump(func_num_args()); var_dump(func_get_arg(1)); var_dump(func_get_args()); } show(1,2,3); ~~~ ~~~ int(3) //參數個數 int(2) //下標為1的參數 array(3) { //返回包括所有參數在內的數組 [0]=> int(1) [1]=> int(2) [2]=> int(3) } ~~~ ## 第二種實現方式 ~~~ function show(... $nums){ //...表示參數 , 但是要參數類型要一致 $sum = 0; foreach($nums as $value){ $sum+=$value; } return $sum; } echo show(1,2,3); ~~~ ~~~ 6 ~~~
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