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/**************
This code is public domain.

This function increments a case-sensitive alphanumeric
number.  It will use as many digits as you give it.  If
it tries to increment a number that is at it's maximum
(eg "ZZ"), it returns boolean false.
**************/

define('NUMBER_START', ord('0'));
define('NUMBER_END', ord('9'));
define('LOWER_START', ord('a'));
define('LOWER_END', ord('z'));
define('UPPER_START', ord('A'));
define('UPPER_END', ord('Z'));

function incrementNumber($number) {
	if (strlen($number) == 0)
		return false;
	
	$number = str_split($number);
	$last = ord(array_pop($number));
	switch ($last) {
		case NUMBER_END:
			$last = LOWER_START;
			break;
		case LOWER_END:
			$last = UPPER_START;
			break;
		case UPPER_END:
			$last = NUMBER_START;
			$inc = incrementNumber(implode($number));
			if ($inc === false)
				return false;
			$number = str_split($inc);
			break;
		default:
			$last++;
	}
	$last = chr($last);
	$number[] = $last;
	return implode($number);
}

// Usage
echo incrementNumber('0000'); // outputs "0001"
echo incrementNumber('0aB4'); // outputs "0aB5"
echo incrementNumber('0aB9'); // outputs "0aBa"
echo incrementNumber('0aBz'); // outputs "0aBA"
echo incrementNumber('0aBZ'); // outputs "0aC0"

1	-
1	+	/**************
2		This code is public domain.
3
4		This function increments a case-sensitive alphanumeric
5		number. It will use as many digits as you give it. If
6		it tries to increment a number that is at it's maximum
7		(eg "ZZ"), it returns boolean false.
8		**************/
9
10		define('NUMBER_START', ord('0'));
11		define('NUMBER_END', ord('9'));
12		define('LOWER_START', ord('a'));
13		define('LOWER_END', ord('z'));
14		define('UPPER_START', ord('A'));
15		define('UPPER_END', ord('Z'));
16
17		function incrementNumber($number) {
18		if (strlen($number) == 0)
19		return false;
20
21		$number = str_split($number);
22		$last = ord(array_pop($number));
23		switch ($last) {
24		case NUMBER_END:
25		$last = LOWER_START;
26		break;
27		case LOWER_END:
28		$last = UPPER_START;
29		break;
30		case UPPER_END:
31		$last = NUMBER_START;
32		$inc = incrementNumber(implode($number));
33		if ($inc === false)
34		return false;
35		$number = str_split($inc);
36		break;
37		default:
38		$last++;
39		}
40		$last = chr($last);
41		$number[] = $last;
42		return implode($number);
43		}
44
45		// Usage
46		echo incrementNumber('0000'); // outputs "0001"
47		echo incrementNumber('0aB4'); // outputs "0aB5"
48		echo incrementNumber('0aB9'); // outputs "0aBa"
49		echo incrementNumber('0aBz'); // outputs "0aBA"
50		echo incrementNumber('0aBZ'); // outputs "0aC0"