Example of PHP implementation of hexadecimal and decimal conversion function

The example in this article describes how PHP implements the conversion function between hexadecimal and decimal. Share it with everyone for your reference, as follows:

/**
 * @desc im:十进制数转换成三十六机制数
 * @param (int)$num 十进制数
 * return 返回：三十六进制数
*/
function get_char($num) {
  $num = intval($num);
  if ($num <= 0)
    return false;
  $charArr = array("0","1","2","3","4","5","6","7","8","9",&#39;A&#39;, &#39;B&#39;, &#39;C&#39;, &#39;D&#39;, &#39;E&#39;, &#39;F&#39;, &#39;G&#39;, &#39;H&#39;, &#39;I&#39;, &#39;J&#39;, &#39;K&#39;, &#39;L&#39;, &#39;M&#39;, &#39;N&#39;, &#39;O&#39;, &#39;P&#39;, &#39;Q&#39;, &#39;R&#39;, &#39;S&#39;, &#39;T&#39;, &#39;U&#39;, &#39;V&#39;, &#39;W&#39;, &#39;X&#39;, &#39;Y&#39;, &#39;Z&#39;);
  $char = &#39;&#39;;
  do {
    $key = ($num - 1) % 36;
    $char= $charArr[$key] . $char;
    $num = floor(($num - $key) / 36);
  } while ($num > 0);
  return $char;
}
/**
 * @desc im:三十六进制数转换成十机制数
 * @param (string)$char 三十六进制数
 * return 返回：十进制数
 */
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;
}

Usage examples:

echo "get_char:".get_char(514549)."<br>";
echo "get_num:".get_num(&#39;A0ZZ&#39;)."<br>";

I hope this article will be helpful to everyone in PHP programming.

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