标签:php7 time string cti read 字符串 ref too xpl
<?php /* * 随机数算法 * 伪随机数 根据分布概率 */ final class Random { /* * 生成一个随机的字符串 * $codeLength 越大重复概率越低 * 随机种子使用时间和位运算作为最基础,一微秒做到百万分之一或者千万分之一的重复概率 * uniqid()函数测试 for php7.2写入10万次往数据库无一重复,函数源码有待研究,目前猜测是根据时间微妙有一部分外加随机一部分数据 */ // protected static $last = 0; protected static $microsecond = 1; //返回长度并不一定 写入10万次往数据库无一重复 也和uniqid()达到同样效果 public static function BasicsRandom() { $code = ‘‘; $time = self::getTime(); //十进制转16进制 base_convert 支持的浮点数有大小限制 $prefix = base_convert($time[‘time‘], 10, 32); //截取后面微秒 $microsecond = $time[‘right‘]; self::$microsecond += 10; $four = (int) $microsecond + self::$microsecond; $suffix = mb_substr((string) $four, 0, 5); $code = $prefix . base_convert($suffix, 10, 32); return $code; } public static function getRandomNumber() { $code = ‘‘; $time = self::getTime(); $prefix = $time[‘time‘]; //截取后面微秒 $microsecond = $time[‘right‘]; self::$microsecond += 10; $four = (int) $microsecond + self::$microsecond; $suffix = mb_substr((string) $four, 0, 5); $code = $prefix . $suffix; return $code; } /* * 利用系统的组件实现机器随机,因为是现在很多是虚拟机,模拟真实机器,但是随机程度依然很大 * * dev/urandom生成的速度比/dev/random快。如果不能立即生成随机串,/dev/random会一直阻塞,有时会非常耗费CPU; * /dev/urandom则会根据其他值立即生成一个随机串,不会阻塞。/dev/urandom生成的随机值没有/dev/random随机。大多数情况下,我们选用/dev/urandom * 没有时间验证真假,linux采用的是/dev/urandom windows采用是 * https://www.cnblogs.com/zx-admin/p/10282021.html DLL下载 和安装 * */ public static function machineRandom($length = 16) { /* * win 返回字符串长度,根据 $length 变化 * linux 返回字符串长度,根据 $length 变化 * 需要自己根据实际情况测试 */ try { $pr_bits = ‘‘; //防止大小写问题 if (mb_substr(strtolower(PHP_OS), 0, 3) == ‘win‘) { $CAPI_Util = new COM(‘CAPICOM.Utilities.1‘); $pr_bits = $CAPI_Util->GetRandom($length, 0); //返回是26位的字符串 tOONrQXC1YF7erMcER1jww== if (!empty($pr_bits)) { return $pr_bits; } else { throw new \Exception(‘return data is empty‘); } } else { $fp = @fopen(‘/dev/urandom‘, ‘rb‘); if ($fp !== FALSE) { $pr_bits = @fread($fp, $length); @fclose($fp); } //返回是32位的字符串 e717c3ee007e669f84f0a2426d65d368 if (!empty(bin2hex($pr_bits))) { return bin2hex($pr_bits); } else { throw new \Exception(‘return data is empty‘); } } } catch (Exception $e) { throw new \Exception($e->getMessage()); } } public static function getTime() { /* * 测试 1989年 小数点后是五位数,但是近几年是四位数 * 统一 乘以 五位数的0 */ // return (double) microtime(true) * 100000; $time = microtime(true); $array = explode(‘.‘, $time); // p($array); if (empty($array[‘1‘])) { $return[‘right‘] = str_pad(‘‘, 5, ‘0‘, STR_PAD_RIGHT); } else { $return[‘right‘] = str_pad($array[‘1‘], 5, ‘0‘, STR_PAD_RIGHT); } $return[‘sec‘] = $array[‘0‘]; $return[‘time‘] = $array[‘0‘] . $return[‘right‘]; return $return; } public static function getNumber() { $Number = [0, 1, 2, 3, 4, 5, 6, 7, 8, 9]; return $Number; } public static function getUperString() { $String = [‘A‘, ‘B‘, ‘C‘, ‘D‘, ‘E‘, ‘F‘, ‘G‘, ‘H‘, ‘I‘, ‘J‘, ‘K‘, ‘L‘, ‘M‘, ‘N‘, ‘O‘, ‘P‘, ‘Q‘, ‘R‘, ‘S‘, ‘T‘, ‘U‘, ‘V‘, ‘W‘, ‘X‘, ‘Y‘, ‘Z‘]; return $String; } public static function getLowerString() { $String = [‘a‘, ‘b‘, ‘c‘, ‘d‘, ‘e‘, ‘f‘, ‘g‘, ‘h‘, ‘i‘, ‘j‘, ‘k‘, ‘l‘, ‘m‘, ‘n‘, ‘o‘, ‘p‘, ‘q‘, ‘r‘, ‘s‘, ‘t‘, ‘u‘, ‘v‘, ‘w‘, ‘x‘, ‘y‘, ‘z‘]; return $String; } public static function getString() { $String = array(‘a‘, ‘b‘, ‘c‘, ‘d‘, ‘e‘, ‘f‘, ‘g‘, ‘h‘, ‘i‘, ‘j‘, ‘k‘, ‘l‘, ‘m‘, ‘n‘, ‘o‘, ‘p‘, ‘q‘, ‘r‘, ‘s‘, ‘t‘, ‘u‘, ‘v‘, ‘w‘, ‘x‘, ‘y‘, ‘z‘, ‘A‘, ‘B‘, ‘C‘, ‘D‘, ‘E‘, ‘F‘, ‘G‘, ‘H‘, ‘I‘, ‘J‘, ‘K‘, ‘L‘, ‘M‘, ‘N‘, ‘O‘, ‘P‘, ‘Q‘, ‘R‘, ‘S‘, ‘T‘, ‘U‘, ‘V‘, ‘W‘, ‘X‘, ‘Y‘, ‘Z‘, ‘0‘, ‘1‘, ‘2‘, ‘3‘, ‘4‘, ‘5‘, ‘6‘, ‘7‘, ‘8‘, ‘9‘, ‘!‘, ‘@‘, ‘#‘, ‘$‘, ‘%‘, ‘^‘, ‘&‘, ‘*‘, ‘(‘, ‘)‘, ‘-‘, ‘_‘, ‘[‘, ‘]‘, ‘{‘, ‘}‘, ‘<‘, ‘>‘, ‘~‘, ‘`‘, ‘+‘, ‘=‘, ‘,‘, ‘.‘, ‘;‘, ‘:‘, ‘/‘, ‘?‘, ‘|‘); return $String; } public static function convert2To16($mybit) { $_32hexa = ""; $index = -4; while (abs($index) <= 240) { $a = substr($mybit, $index, 4); $index = $index - 4; $_32hexa = base_convert($a, 2, 16) . $_32hexa; } return $_32hexa; } public static function convert2To32($mybit) { $_32hexa = ""; $index = -5; while (abs($index) <= 240) { //多少位 ,默认240位 $a = substr($mybit, $index, 4); $index = $index - 5; $_32hexa = base_convert($a, 2, 32) . $_32hexa; } return $_32hexa; } }
标签:php7 time string cti read 字符串 ref too xpl
原文地址:https://www.cnblogs.com/zx-admin/p/10304461.html