$countQuery = "SELECT COUNT(id) FROM donations";
$outcomeQuery = mysql_query($countQuery);
$countUp = mysql_fetch_array($outcomeQuery);
$plusOne = 1;
$outcome = $countUp;
echo $outcome[0]
    or die(mysql_error());

$countQuery = mysql_query("SELECT id FROM donations");
$count=mysql_num_rows($countQuery);
$count+=1;

SELECT COUNT(id)+1 as IDCount FROM donations

insert into tableName (ID,Name) values (null, 'Fluffeh');