function random_message_id($length = 6)
{
// start with a blank string..
// define possible characters
//"0" is not an allowed digit, as a leading "0" could be misleading
//total address space is approx 730M (30**6)
//initially using only a subset of the address space (~120M) to allow for better database management
$possible = "123456789bcdfghjklmnpqrstvwxyz";
//$possible0 = "12345";//table "message"
$possible0 = "a";
//table "amessage"; allow "a" as a prefix, but not in the remaining 5 characters
// set up a counter
$i = 0;
$j = 0;
// add random characters to $password until $length is reached
while ($j < 100) {
$rand_message_id = "";
while ($i < $length) {
// pick a random character from the possible ones
if ($i == 0) {
$char = substr($possible0, mt_rand(0, strlen($possible0) - 1), 1);
} else {
$char = substr($possible, mt_rand(0, strlen($possible) - 1), 1);
}
$rand_message_id .= $char;
$i++;
}
$model = new TwextraModel();
$result = $model->urlHit($rand_message_id);
if ($result == 'miss') {
break;
}
$j++;
$i = 0;
}
// done!
return $rand_message_id;
}
