while($sum<100){//小宠物的饥饿程度到100，表示小宠物吃饱啦,不用继续喂了，没吃饱继续喂食
$num = rand(1,20);//随机数，模拟喂食小宠物的小面包
$sum = $sum + $num; //小宠物吃小面包
echo "$sum";
if($sum<100){
echo "我还没吃饱呢！";
}else{
echo "终于吃饱啦^_^";
}
echo "
";
}
<?php
while ($sum < 100) {
$num = rand(1, 20);
$sum = $sum + $num;
echo $sum."<br/>";
if($sum < 100) {
echo "小宠物还么有吃饱呢";
}else {
echo "小宠物已经吃饱了";
}
}