由网友(告诉自己、要坚强)分享简介：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...

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

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/*
 * 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;
}