php短网址和数字之间相互转换的方法

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<?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;

}