PHP 函数中的可变参数是如何工作的？

function myFunction(...$args) {  // ...}

myFunction(1, 2, 3, 4, 5);

function sum(...$numbers) {  return array_sum($numbers);}echo sum(1, 2, 3, 4, 5); // 输出：15

function printNumbers(...$numbers) {  foreach ($numbers as $number) {    echo "$number";  }}printNumbers(1, 2, 3, 4, 5);

function sum(...$numbers) {  $total = 0;  foreach ($numbers as $number) {    $total += $number;  }  return $total;}echo sum(1, 2, 3, 4, 5); // 输出：15

function logMessage($level, ...$messages) {  // 在日志文件或数据库中记录消息}logMessage('INFO', '用户登录系统。', 'IP 地址：127.0.0.1');