PHP string and array methods
This article mainly introduces the methods of PHP strings and arrays. Interested friends can refer to it. I hope it will be helpful to everyone.
The example in this article describes the method of generating fixed-length pure numeric codes in PHP, as follows:
Many times we need some fixed-length numeric codes, such as order numbers, card numbers, user numbers, etc. ! But often what we have is an ordered number stored in the database, which we can directly convert into a fixed-length numeric code, and then update it to the database to form a unique number for this record.
<?php
/**
* 根据日期或者是给定前缀生成唯一编号
* User: minyifei.cn
* Date: 15/7/7
*/
namespace Minyifei\Libs;
class SequenceNumber {
/**
* 根据显示宽度获取指定的 mapbit
*
* @param integer $width 编号显示宽度
*
* @return array
*/
private static function _getMapbit($width)
{
$mapBits = array(
4=>array(
10, 2, 11, 3, 0, 1, 9, 7, 12, 6, 4, 8, 5,
),
5=>array(
4, 3, 13, 15, 7, 8, 6, 2, 1, 10, 5, 12, 0, 11, 14, 9,
),
6=>array(
2, 7, 10, 9, 16, 3, 6, 8, 0, 4, 1, 12, 11, 13, 18, 5, 15, 17, 14,
),
7=>array(
18, 0, 2, 22, 8, 3, 1, 14, 17, 12, 4, 19, 11, 9, 13, 5, 6, 15, 10, 16, 20, 7, 21,
),
8=>array(
11, 8, 4, 0, 16, 14, 22, 7, 3, 5, 13, 18, 24, 25, 23, 10, 1, 12, 6, 21, 17, 2, 15, 9, 19, 20,
),
9=>array(
24, 23, 27, 3, 9, 16, 25, 13, 28, 12, 0, 4, 10, 18, 11, 2, 17, 1, 21, 26, 5, 15, 7, 20, 22, 14, 19, 6, 8,
),
10=>array(
32, 3, 1, 28, 21, 18, 30, 7, 12, 22, 20, 13, 16, 15, 6, 17, 9, 25, 11, 8, 4, 27, 14, 31, 5, 23, 24, 29, 0, 10, 19, 26, 2,
),
11=>array(
9, 13, 2, 29, 11, 32, 14, 33, 24, 8, 27, 4, 22, 20, 5, 0, 21, 25, 17, 28, 34, 6, 23, 26, 30, 3, 7, 19, 16, 15, 12, 31, 1, 35, 10, 18,
),
12=>array(
31, 4, 16, 33, 35, 29, 17, 37, 12, 28, 32, 22, 7, 10, 14, 26, 0, 9, 8, 3, 20, 2, 13, 5, 36, 27, 23, 15, 19, 34, 38, 11, 24, 25, 30, 21, 18, 6, 1,
),
);
return $mapBits[intval($width)];
}
/**
* 格式化给定时间戳
*
* @param integer $ts timestamp, if null use current timestamp
*
* @return string
*/
private static function _fmtTS($ts=null)
{
$ts = $ts ?: time();
return date(self::$_fmt, $ts);
}
/**
* 根据id获取一个随机唯一编码
* @param $id 编号
* @param int $prefix 前缀
* @param int $width 除前缀外长度
* @return string
*/
public static function generateNumber($id,$prefix=10,$width=8)
{
return sprintf("%s%s", $prefix,self::encode($id, $width));
}
/**
* 编码转换
*
* @param integer $id id
* @param integer $width 编号额外组成部分的显示宽度
*
* @return integer
*/
public static function encode($id, $width)
{
$maximum = intval(str_repeat(9, $width));
$superscript = intval(log($maximum) / log(2));
$r = 0;
$sign = 0x1 << $superscript;
$id |= $sign;
$mapbit = self::_getMapbit($width);
for ($x = 0; $x < $superscript; $x++) {
$v = ($id >> $x) & 0x1;
$r |= ($v << $mapbit[$x]);
}
$r += $maximum - pow(2, $superscript) + 1;
return sprintf("%0${width}s", $r);
}
/**
* 获取唯一编号
*
* @param integer $id id, mostly database primary key
* @param integer $width 编号显示宽度
* @param integer $ts timestamp
*
* @return string
*/
public static function get($id, $width, $ts=null)
{
return sprintf('%s%s', self::_fmtTS($ts), self::encode($id, $width));
}
}Summary: The above is the entire content of this article, I hope it will be helpful to everyone's study.
Related recommendations:
How to count the number of people online through PHP
Usage of switch statement in PHP
How to get the first letter of Chinese pinyin in php program
The above is the detailed content of PHP string and array methods. For more information, please follow other related articles on the PHP Chinese website!
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