PHP:如何像这样的输出列表:AA,AB,AC,一路ZZZY,ZZZZ,ZZZZA等 [英] PHP: How to output list like this: AA, AB, AC, all the way to ZZZY, ZZZZ, ZZZZA etc
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问题描述
我想编写一个函数,将转换为整数,以这样的字符串,但我想不通的逻辑...:(
I'm trying to write a function that'll convert an integer to a string like this, but I can't figure out the logic... :(
1 = a
5 = e
27 = aa
28 = ab
etc...
谁能帮助?我真的niffed,我不能完成我的头围绕如何写这个...:(
Can anyone help? I'm really niffed that I can't wrap my head around how to write this... :(
推荐答案
/*
* Convert an integer to a string of uppercase letters (A-Z, AA-ZZ, AAA-ZZZ, etc.)
*/
function num2alpha($n)
{
for($r = ""; $n >= 0; $n = intval($n / 26) - 1)
$r = chr($n%26 + 0x41) . $r;
return $r;
}
/*
* Convert a string of uppercase letters to an integer.
*/
function alpha2num($a)
{
$l = strlen($a);
$n = 0;
for($i = 0; $i < $l; $i++)
$n = $n*26 + ord($a[$i]) - 0x40;
return $n-1;
}
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