字符串压缩 62进制 微博缩短网址

遇到一个瓶颈,当COOKIE数据达到5K以上的时候,只好将COOKIE数据进行压缩,以减少数据的大小

<?php
//十进制转到其他制
function dec2any($num, $base = 62, $index = false)
{
    if (!$base) {
        $base = strlen($index);
    } elseif (!$index) {
        $index = substr("0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ", 0, $base);
    }
    $out = "";
    for ($t = floor(log10($num) / log10($base)); $t >= 0; $t--) {
        $a = floor($num / pow($base, $t));
        $out = $out . substr($index, $a, 1);
        $num = $num - ($a * pow($base, $t));
    }
    return $out;
}

function any2dec($num, $base = 62, $index = false)
{
    if (!$base) {
        $base = strlen($index);
    } elseif (!$index) {
        $index = substr("0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ", 0, $base);
    }
    $out = 0;
    $len = strlen($num) - 1;
    for ($t = 0; $t <= $len; $t++) {
        $out = $out + strpos($index, substr($num, $t, 1)) * pow($base, $len - $t);
    }
    return $out;
}
?>

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