介绍《PHP编程:php随机抽奖实例分析》开发教程,希望对您有用。
《PHP随机抽奖实例分析》要点:
本文介绍了PHP随机抽奖实例分析,希望对您有用。如果有疑问,可以联系我们。
本文实例讲述了PHP随机抽奖用法.分享给大家供大家参考.具体分析如下:PHP实战
1. 依照设定的概率,得到随机抽奖的结果.
PHP实战
代码如下:
<?PHP
/**
* 抽奖工具
*/
class lottery_tool {
protected static $awardsArr;
protected static $proField = 'probability';
protected static $proSum = 0;
protected static $checkAward = false;
const SUCCESS_CODE = 0;
const FAIL_CODE = -1;
//检查抽奖数据
protected static function checkAwards(){
if (!is_array(self::$awardsArr) || empty(self::$awardsArr)) {
return self::$checkAward = false;
}
self::$proSum = 0;
foreach (self::$awardsArr as $_key => $award) {
self::$proSum += $award[self::$proField];
}
if (empty(self::$proSum)) {
return self::$checkAward = false;
}
return self::$checkAward = true;
}
protected static function successRoll($rollKey){
return array('code' => self::SUCCESS_CODE,'roll_key' => $rollKey,'msg' => 'roll success');
}
protected static function failRoll($msg = 'roll fail'){
return array('code' => self::FAIL_CODE,'msg' => $msg );
}
//抽奖
public static function roll () {
if (false == self::$checkAward) {
return self::failRoll('awards data is not the right format!');
}
$result = mt_rand(0,self::$proSum);
$proValue = 0;
foreach (self::$awardsArr as $_key => $value) {
$proValue += $value[self::$proField];
if ($result <= $proValue) {
return self::successRoll($_key);
}
}
return self::failRoll('wrong');
}
//改变概率字段名
public static function setProField($field = null) {
if (!empty($field)) {
self::$proField = $field;
}
}
//设置奖品
public static function setAwards($awards){
self::$awardsArr = $awards;
self::checkAwards();
}
}
2. 示例代码:
代码如下:
$awards = array(
'0' => array('pro' => 15,'info' => '15%的可能性'),
'1' => array('pro' => 25,'info' => '25%的可能性'),
'2' => array('pro' => 40,'info' => '40%的可能性'),
'3' => array('pro' => 20,'info' => '20%的可能性'),
);
lottery_tool::setProField('pro');
lottery_tool::setAwards($awards);
$result = array();
for ($i = 10000; $i --;) {
$result[] = lottery_tool::roll();
}
foreach ($result as $key => $value) {
$awards[$value['roll_key']]['num'] ++;
}
echo '<pre>';
var_dump($awards);
运行结果如下:
PHP实战
代码如下:
array
0 =>
array
'pro' => int 15
'info' => string '15%的可能性' (length=15)
'num' => int 1596
1 =>
array
'pro' => int 25
'info' => string '25%的可能性' (length=15)
'num' => int 2484
2 =>
array
'pro' => int 40
'info' => string '40%的可能性' (length=15)
'num' => int 3939
3 =>
array
'pro' => int 20
'info' => string '20%的可能性' (length=15)
'num' => int 1981
希望本文所述对大家的PHP程序设计有所赞助.PHP实战
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