<?php
/**
* "抽奖"函数
*
* @param integer $first 起始编号
* @param integer $last 结束编号
* @param integer $total 获奖人数
*
* @return string
*
*/
function isWinner($first, $last, $total)
{
$winner = array();
for ($i=0;;$i++)
{
$number = mt_rand($first, $last);
if (!in_array($number, $winner))
$winner[] = $number; // 如果数组中没有该数，将其加入到数组
if (count($winner) == $total) break;
}
return implode(' ', $winner);
}
// for test
echo isWinner(1, 100, 5);
?>
