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- <?php
-
- namespace fast;
-
- /**
- * 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 int $num 默认为1,即随机出来的数量
- * @param bool $unique 默认为true,即当num>1时,随机出的数量是否唯一
- * @return mixed 当num为1时返回键名,反之返回一维数组
- */
- public static function lottery($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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