随机生成类

来源:转载

<?php
/**
* 随机生成类
*/
class Random
{
/**
* 生成数字和字母
*
* @param int $len 长度
* @return string
*/
public static function alnum($len = 6)
{
return self::build('alnum', $len);
}
/**
* 仅生成字符
*
* @param int $len 长度
* @return string
*/
public static function alpha($len = 6)
{
return self::build('alpha', $len);
}
/**
* 生成指定长度的随机数字
*
* @param int $len 长度
* @return string
*/
public static function numeric($len = 4)
{
return self::build('numeric', $len);
}
/**
* 数字和字母组合的随机字符串
*
* @param int $len 长度
* @return string
*/
public static function nozero($len = 4)
{
return self::build('nozero', $len);
}
/**
* 能用的随机数生成
* @param string $type 类型 alpha/alnum/numeric/nozero/unique/md5/encrypt/sha1
* @param int $len 长度
* @return string
*/
public static function build($type = 'alnum', $len = 8)
{
switch ($type)
{
case 'alpha':
case 'alnum':
case 'numeric':
case 'nozero':
switch ($type)
{
case 'alpha':
$pool = 'abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ';
break;
case 'alnum':
$pool = '0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ';
break;
case 'numeric':
$pool = '0123456789';
break;
case 'nozero':
$pool = '123456789';
break;
}
return substr(str_shuffle(str_repeat($pool, ceil($len / strlen($pool)))), 0, $len);
case 'unique':
case 'md5':
return md5(uniqid(mt_rand()));
case 'encrypt':
case 'sha1':
return sha1(uniqid(mt_rand(), TRUE));
}
}
/**
* 根据数组元素的概率获得键名
*
* @param array $ps array('p1'=>20, 'p2'=>30, 'p3'=>50);
* @param array $num 默认为1,即随机出来的数量
* @param array $unique 默认为true,即当num>1时,随机出的数量是否唯一
* @return mixed 当num为1时返回键名,反之返回一维数组
*/
public static function lottery($ps, $num = 1, $unique = true)
{
if (!$ps)
{
return $num == 1 ? '' : [];
}
if ($num >= count($ps) && $unique)
{
$res = array_keys($ps);
return $num == 1 ? $res[0] : $res;
}
$max_exp = 0;
$res = [];
foreach ($ps as $key => $value)
{
$value = substr($value, 0, stripos($value, ".") + 6);
$exp = strlen(strchr($value, '.')) - 1;
if ($exp > $max_exp)
{
$max_exp = $exp;
}
}
$pow_exp = pow(10, $max_exp);
if ($pow_exp > 1)
{
reset($ps);
foreach ($ps as $key => $value)
{
$ps[$key] = $value * $pow_exp;
}
}
$pro_sum = array_sum($ps);
if ($pro_sum < 1)
{
return $num == 1 ? '' : [];
}
for ($i = 0; $i < $num; $i++)
{
$rand_num = mt_rand(1, $pro_sum);
reset($ps);
foreach ($ps as $key => $value)
{
if ($rand_num <= $value)
{
break;
}
else
{
$rand_num -= $value;
}
}
if ($num == 1)
{
$res = $key;
break;
}
else
{
$res[$i] = $key;
}
if ($unique)
{
$pro_sum -= $value;
unset($ps[$key]);
}
}
return $res;
}
/**
* 获取全球唯一标识
* @return string
*/
public static function uuid()
{
return sprintf(
'%04x%04x-%04x-%04x-%04x-%04x%04x%04x', mt_rand(0, 0xffff), mt_rand(0, 0xffff), mt_rand(0, 0xffff), mt_rand(0, 0x0fff) | 0x4000, mt_rand(0, 0x3fff) | 0x8000, mt_rand(0, 0xffff), mt_rand(0, 0xffff), mt_rand(0, 0xffff)
);
}
}

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