<?php
namespace laytp\library;
class Random
{
public static function alnum($len = 6)
{
return self::build('alnum', $len);
}
public static function alpha($len = 6)
{
return self::build('alpha', $len);
}
public static function numeric($len = 4)
{
return self::build('numeric', $len);
}
public static function nozero($len = 4)
{
return self::build('nozero', $len);
}
public static function build($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, $len);
case 'unique':
case 'md5':
return md5(uniqid(mt_rand()));
case 'encrypt':
case 'sha1':
return sha1(uniqid(mt_rand(), true));
}
}
public static function lottery($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;
}
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)
);
}
}