将int，bigint整型数值可逆转换字符串

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将 Int 和 BigInt 类型数值转换为字符串的可逆方法，可用于缩短网址或记录的ID转换等。
如： 9223372036854775807 => aZl8N0y58M7

class Convert{    /**     * 默认密钥字符串     * @var string     */    const KEY = '0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ';    /**     * 将 Int 类型十进制数值转换为指定进制编码     * @param int|string $num 取值范围 0 ~ 2147483647 之间     * @return string     */    public static function encodeInt($num) {        $str = '';        if ($num <= 0)            $str = substr(self::KEY, 0, 1);        while ($num > 0) {            $val = intval($num / 62);            $mod = $num % 62;            $str = substr(self::KEY, $mod, 1) . $str;            $num = $val;        }        return $str;    }    /**     * 将编码字符串转换为 Int 类整型数值     * @param string $code     * @return int     */    public static function decodeInt($code){        $result = null;        $len = strlen($code);        for ($i = 1; $i <= $len; $i++) {            $char = substr($code, $i - 1, 1);            $result += intval(strpos(self::KEY, $char)) * pow(62, $len - $i);        }        return $result;    }    /**     * 支持15位长度的整型，超过则精度大幅降低     * @param int $num     * @return string     */    public static function encodeInt2($num) {        $out = '';        for ($t = floor(log10($num)/log10(62)); $t >= 0; $t--) {            $a = floor($num/bcpow(62, $t));            $out = $out . substr(self::KEY, $a, 1);            $num = $num - $a * pow(62, $t);        }        return $out;    }    /**     * 支持最大15位整型字符串的解码     * @param string $num     * @return string     */    public static function decodeInt2($num) {        $out = 0;        $len = strlen($num) - 1;        for ($t = 0; $t <= $len; $t++) {            $out = $out + strpos(self::KEY, substr( $num, $t, 1 )) * pow(62, $len - $t);        }        return $out;    }    /**     * 将 BigInt 类型的数值转换为指定进制值     * @param int|string $num     * @return string     */    public static function encodeBigInt($num) {        bcscale(0);        $str = '';        if ($num <= 0)            $str = substr(self::KEY, 0, 1);        while ($num > 0) {            $div = bcdiv($num, 62);            $mod = bcmod($num, 62);            $str = substr(self::KEY, $mod, 1) . $str;            $num = $div;        }        return $str;    }    /**     * 将编码字符串转换为 BigInt 类整型数值     * @param string $code     * @return string     */    public static function decodeBigInt($code) {        bcscale(0);        $result = '';        $len = strlen($code);        for ($i = 1; $i <= $len; $i++) {            $char = substr($code, $i - 1, 1);            $result = bcadd(bcmul(strpos(self::KEY, $char), bcpow(62, $len - $i)), $result);        }        return $result;    }}

测试方法：
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结果：
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echo 'Begin ~~<br><hr><br>';$begin = microtime(true);$bm = memory_get_usage();$j = 0;$cv = new Convert();//for ($i = 0; $i < 10000; $i++) {    $raw = '9223372036854775807';//rand(200000, 214748) . rand(1000, 3648);    $encode = $cv->encodeBigInt($raw);    $decode = $cv->decodeBigInt($encode);//    $encode = $is->encodeInt($raw);//    $decode = number_format($is->decodeInt($encode), 0, '', '');    if ($raw != $decode) {        $j++;//        echo '<script>alert("not same");</script>';    }//}    echo '原文: '. $raw .' 长度: '. strlen($raw) .'<br>';    echo '编码: '. $encode .' 长度: '. strlen($encode) .'<br>';    echo '解码: '. $decode .'<br>';echo '不一致：'. $j;echo '<br>';$em = memory_get_usage();echo 'End !<br><hr><br>Use Time :';echo microtime(true) - $begin;echo '<br><hr><br>Use Mem:';echo ceil(($em - $bm)/1024/1024) .'MB';

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