杜郎俊赏

62进制转换

//十进制转为 62 进制function encode62($number){ $base = 62; $index = '0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ'; $ret = ''; for ($t = floor(log10($number) / log10($base)); $t >= 0; $t--) { $a = floor($number / pow($base, $t)); $ret .= substr($index, $a, 1); $number -= $a * pow($base, $t); } return $ret;}//62 进制转为十进制function decode62($number){ $base = 62; $index = '0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ'; $ret = 0; $len = strlen($number) - 1; for ($t = 0; $t <= $len; $t++) { $ret += strpos($index, substr($number, $t, 1)) * pow($base, $len - $t); } return $ret;}

标签:笔记
日期:2017-08-31