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@shiny
Created July 28, 2013 05:24
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短网址代码和数字的互转
<?php
/**
* 将数字转为短网址代码
*
* @param int $number 数字
* @return string 短网址代码
*/
function generate_code($number) {
$out = "";
$codes = "abcdefghjkmnpqrstuvwxyz23456789ABCDEFGHJKMNPQRSTUVWXYZ";
while ($number > 53) {
$key = $number % 54;
$number = floor($number / 54) - 1;
$out = $codes{$key}.$out;
}
return $codes{$number}.$out;
}
/**
* 将短网址代码转为数字
*
* @param string $code 短网址代码
* @return int 数字
*/
function get_num($code){
$codes = "abcdefghjkmnpqrstuvwxyz23456789ABCDEFGHJKMNPQRSTUVWXYZ";
$num = 0;
$i = strlen($code);
for($j=0;$j<strlen($code);$j++){
$i--;
$char = $code{$j};
$pos = strpos($codes,$char);
$num += (pow(54, $i) * ($pos + 1));
}
$num--;
return $num;
}
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