ขอแนวทางหน่อยค่ะ คือต้องการ แรนดอมตัวเลขไปเก็บใน db ค่ะ

<?php
function random_password($len)
{
	srand((double)microtime()*10000000);
	$chars = "0123456789";
	$ret_str = "";
	$num = strlen($chars);
	for($i = 0; $i < $len; $i++)
	{
		$ret_str.= $chars[rand()%$num];
		$ret_str.="";
	}
	return $ret_str;
}

$intRandom  = random_password(6);
echo $intRandom."<br>"; 
mysql_connect("localhost","root","root");
mysql_select_db("mydatabase");
	
	$strSQL = "SELECT * FROM tbl_test WHERE pwd = '".trim($intRandom)."' ";
	$objQuery = mysql_query($strSQL);
	$objResult = mysql_fetch_array($objQuery);
	if($objResult)
	{
			echo "already exists!";
	}
	else
	{	
		
		$strSQL = "INSERT INTO tbl_test (pwd) VALUES ('".trim($intRandom)."')";
		$objQuery = mysql_query($strSQL);
		
		echo "Save Done.";
	
	}

	mysql_close();
?>