<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<?php

$dic = array(
	0 => '0', 1 => '1', 2 => '2', 3 => '3', 4 => '4', 5 => '5', 6 => '6', 7 => '7', 8 => '8', 9 => '9',
	10 => 'A', 11 => 'B', 12 => 'C', 13 => 'D', 14 => 'E', 15 => 'F', 16 => 'G', 17 => 'H', 18 => 'I',
	19 => 'J', 20 => 'K', 21 => 'L', 22 => 'M', 23 => 'N', 24 => 'O', 25 => 'P', 26 => 'Q', 27 => 'R',
	28 => 'S', 29 => 'T', 30 => 'U', 31 => 'V', 32 => 'W', 33 => 'X', 34 => 'Y', 35 => 'Z'
	);

 //十進位制轉換三十六進位制
function enid($int, $format = 8) {
	global $dic;
	$arr = array();
	$loop = true;
	while ($loop) 
	{
		$arr[] = $dic[bcmod($int, 36)];
		$int = floor(bcdiv($int, 36));
		if ($int == 0) {
			$loop = false;
		}
	}
	array_pad($arr, $format, $dic[0]);
	return implode('', array_reverse($arr));
}

//三十六進位制轉換十進位制
function deid($id) {
	global $dic;
	// 鍵值交換
	$dedic = array_flip($dic);
	// 去零
	$id = ltrim($id, $dic[0]);
	// 反轉
	$id = strrev($id);
	$v = 0;
	for($i = 0, $j = strlen($id); $i < $j; $i++) 
	{
		$v = bcadd(bcmul($dedic[$id{$i}] , bcpow(36, $i)) , $v);
	}
	return $v;
}

// 遍歷三位所有的三十六進位制數
$i = deid('ZZZ');
$b = array();
while ($i > 0) {
	$id_dym = str_pad(enid($i), 3, 0, STR_PAD_LEFT);
	echo strtolower($id_dym), '<br>';
	$i--;
}