How to properly handle expected parameter errors encountered

Question

functioncalculate(){echo"Number of parameters:".func_get_args();echo"The third parameter is:".func_get_arg(3);print_r(func_get_arg());$result=0;foreach(func_get_arg()as$ arg):$result+=$arg;endforeach;echo$result;c

P粉197639753 · Answer

Latest versions of PHP do not allow a mismatch between the function parameter list and the parameter list in the call. You can use ellipses in the argument list to allow unlimited arguments instead of calling func_get_args().

function calculate(...$args){
    echo "参数个数：" . count($args) ;
    echo "第3个参数是：" . $args[3];
    print_r($args);
    $result = 0;
    foreach($args as $arg) :
        $result += $arg;
    end foreach;
    echo $result;
}