/**
* Generates a random string from the given set.
*
* @param int $length
* The length of the string to create.
*
* @param char $set
* The character set to use when generating the string.
* - d: digits
* - h: hex
* - u: alpha uppercase
* - l: alpha lowercase
* - o: alpha uppercase and lowercase only
* - A: alpha numeric uppercase
* - a: alpha numeric lowercase
* - m: mixed
*/
public static function rand_string($length, $set = 'm')
{
$a = array('d', 'h', 'u', 'l', 'A', 'a', 'm', 'o');
$s = 'm';
if ($set != 'A') {
$set = strtolower($set);
}
if (in_array($set, $a)) {
$s = $set;
}
$random = '';
mt_srand((double) microtime() * 1000000);
$chars = get::getCharacterSet($s);
while (strlen($random) < $length) {
$random .= substr($chars, mt_rand() % strlen($chars), 1);
}
return $random;
}
