

/** FUNCTION: generate_ID
*
* This function generates a random ID of letters and numbers
* as long as is desired.
*
* @ARGUMENTS: 2
* 				- $np: This determines how many parts are randomly 
*					generated. Some parts will be numbers and 
*					some will be letters.
* 				- $npp: This is the number of pieces-per-part. Each
*					part is made up of multiple pieces
* @RETURNS: 
* 				- $id: The randomly Generated ID
**/
function generate_ID($np,$npp)
{
	// The id to create
	$id = ""; 
	
	// Create an array of characters
	$aplha = "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";
	$aplha = explode(" ", $aplha);
	
	for ($j = 0; $j < $np; $j++)
	{
		$r = rand(1,2);
		for ($i = 0; $i < $npp; $i++)
		{
			if ($r == 1)
			{
				// Generate random numbers
				$id .= rand(1,9);
			}
			else 
			{
				// Generate random letters
				$a = rand(1,26);
				$id .= $aplha[$a];
			}
		}
	}
	return $id;
}