<?php
header("Content-type:text/html;charset=utf-8");
?>
<form method="post" action="">
<input type="text" name="bl"/><input type="submit" value="计算"/>
<p> 多个随机比率英文,分割 例：50%,5%,0.5% </p>
</form>
<?php
if(!empty($_POST)){
echo $_POST['bl'];//获取值
echo "<hr/>";
$yarr = $arr = explode(',',$_POST['bl']);//字符串转为数组
print_r($arr);
echo "<hr/>";
rsort($arr);//数组按值重大到小排序
print_r($arr);
echo "<hr/>";
echo end($arr);//取最小值
echo "<hr/>";
$bl = end($arr);//取最小值赋值
echo trim($bl,'%');
echo "<hr/>";
echo strstr(trim($bl,'%'),'.');//去除%，并根据小数点截取
if(strstr(trim($bl,'%'),'.')){//去除%，并根据小数点截取，判断是否截取到值
$cishu = strlen(strstr(trim($bl,'%'),'.'))-1;
$beishu = 10;
for($i=1;$i<$cishu;$i++){//小数点前移
$beishu = $beishu*10;
}
}else{
$beishu = 1;
}
echo $beishu;
echo "<hr/>";
$count = '';
$nums = '';
foreach($yarr as $val){
$count += $num[] = $nums = $val*$beishu+$nums;//取值范围重新赋值
}
echo $count;
echo "<hr/>";
print_r($num);
echo "<hr/>";
$rand_num = rand(1,$beishu*100);//根据倍数换算，随机取比率范围内的值
$k = "";
foreach($num as $key=>$val){
if($key == 0){//判断是否是第一次循环
if($rand_num >= 1 && $rand_num <= $val){//按范围判断是否出现在该中奖段
echo "恭喜你中奖了";
$k = $key;
break;
}
}else{
if($rand_num > $num[$key-1] && $rand_num <= $val){//取上一次的值和本次比较，判断是否出现在该中奖段
echo "恭喜你中奖了";
$k = $key;
break;
}
}
}
echo $k;
}
?>