php多個隨機比率計算

<?php

header("Content-type:text/html;charset=utf-8"); 

?>

<form method="post" action="">

<input type="text" name="bl"/><input type="submit" value="計算"/>

<p> 多個隨機比率英文,分割 例：50%,5%,0.5% </p>

</form>

<?php

if(!empty($_POST)){

echo $_POST['bl'];//獲取值

echo "<hr/>";

$yarr = $arr = explode(',',$_POST['bl']);//字符串轉為數組

print_r($arr);

echo "<hr/>";

rsort($arr);//數組按值重大到小排序

print_r($arr);

echo "<hr/>";

echo end($arr);//取最小值

echo "<hr/>";

$bl = end($arr);//取最小值賦值

echo trim($bl,'%');

echo "<hr/>";

echo strstr(trim($bl,'%'),'.');//去除%，并根據小數點截取

if(strstr(trim($bl,'%'),'.')){//去除%，并根據小數點截取，判斷是否截取到值

    $cishu = strlen(strstr(trim($bl,'%'),'.'))-1;

    $beishu = 10;

    for($i=1;$i<$cishu;$i++){//小數點前移

        $beishu = $beishu*10;

    }

}else{

    $beishu = 1;

}

echo $beishu;

echo "<hr/>";

$count = '';

$nums = '';

foreach($yarr as $val){

$count += $num[] = $nums = $val*$beishu+$nums;//取值范圍重新賦值

}

echo $count;

echo "<hr/>";

print_r($num);

echo "<hr/>";

$rand_num = rand(1,$beishu*100);//根據倍數換算，隨機取比率范圍內的值

$k = "";

foreach($num as $key=>$val){

if($key == 0){//判斷是否是第一次循環

if($rand_num >= 1 && $rand_num <= $val){//按范圍判斷是否出現在該中獎段

echo "恭喜你中獎了";

$k = $key;

break;

}

}else{

if($rand_num > $num[$key-1] && $rand_num <= $val){//取上一次的值和本次比較，判斷是否出現在該中獎段

echo "恭喜你中獎了";

$k = $key;

break;

}

}

}

echo $k;

}

?>