如何在PHP中将base64转换为base10？

Question

我目前在PHP中将base10数字转换为base64.但我不知道在php中将base64转换为base10!

我该怎么做？

我将base10转换为base64的算法:

$rep = array('0','1','2','3','4','5','6','7','8','9','a','b','c','d','e','f','g','h','i','j','k','l','m','n','o','p','q','r','s','t','u','v','w','x','y','z','A','B','C','D','E','F','G','H','I','J','K','L','M','N','O','P','Q','R','S','T','U','V','W','X','Y','Z','-','_');
$new = "";
while ($num>0) {
    $r = $num % 64;
    $new .= $rep[$r];
    $num = floor($num/64);
}

Answer 1

这是一种Javascript方式.也许你可以为php编写一个代码.

var ALPHABET = {'-': 62, '1': 53, '0': 52, '3': 55, '2': 54, '5': 57, '4': 56, '7': 59, '6': 58, '9': 61, '8': 60, 'A': 0, 'C': 2, 'B': 1, 'E': 4, 'D': 3, 'G': 6, 'F': 5, 'I': 8, 'H': 7, 'K': 10, 'J': 9, 'M': 12, 'L': 11, 'O': 14, 'N': 13, 'Q': 16, 'P': 15, 'S': 18, 'R': 17, 'U': 20, 'T': 19, 'W': 22, 'V': 21, 'Y': 24, 'X': 23, 'Z': 25, '_': 63, 'a': 26, 'c': 28, 'b': 27, 'e': 30, 'd': 29, 'g': 32, 'f': 31, 'i': 34, 'h': 33, 'k': 36, 'j': 35, 'm': 38, 'l': 37, 'o': 40, 'n': 39, 'q': 42, 'p': 41, 's': 44, 'r': 43, 'u': 46, 't': 45, 'w': 48, 'v': 47, 'y': 50, 'x': 49, 'z': 51};

function decode(s) {
    var n = 0;
    for(var i=0; i < s.length; i++) {
        var c = s.charAt(i);
        n = n * 64 + ALPHABET[c];
    }
    return n;
}

console.log(decode('EqfyK'));