/**
 * @desc im:十進制數(shù)轉(zhuǎn)換成三十六機制數(shù)
 * @param (int)$num 十進制數(shù)
 * return 返回：三十六進制數(shù)
*/
function get_char($num) {
  $num = intval($num);
  if ($num <= 0)
    return false;
  $charArr = 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');
  $char = '';
  do {
    $key = ($num - 1) % 36;
    $char= $charArr[$key] . $char;
    $num = floor(($num - $key) / 36);
  } while ($num > 0);
  return $char;
}
/**
 * @desc im:三十六進制數(shù)轉(zhuǎn)換成十機制數(shù)
 * @param (string)$char 三十六進制數(shù)
 * return 返回：十進制數(shù)
 */
function get_num($char){
  $array=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");
  $len=strlen($char);
  for($i=0;$i<$len;$i++){
    $index=array_search($char[$i],$array);
    $sum+=($index+1)*pow(36,$len-$i-1);
  }
  return $sum;
}