按照设定的概率，得到随机choujiang的结果

本帖最后由 独孤求败 于 2015-2-23 20:18 编辑

/**
* **工具
*/
cl** 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**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;
}

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 );
}

//**
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 += $value;
if ($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 = $awards;
self::checkAwards();
}
}
. forexample 跳至
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$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] ++;
}

echo '

';

var_dump($awards);

//结果：

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
/**

 * **工具

 */

cl** 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**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;

        }

 

        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 );

    }

 

    //**

    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; 

            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();

    }

}

. forexample 跳至  

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$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] ++;

}

 

echo '
';

var_dump($awards);

//结果：

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