How to implement the conversion function between hexadecimal and decimal in php

This article mainly introduces the function of converting hexadecimal to decimal in PHP, and analyzes related techniques of PHP numerical operation and string operation in the form of examples. Friends in need can refer to this article

The example describes how PHP implements the conversion function between hexadecimal and decimal. Share it with everyone for your reference, the details are 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>";

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