Question

function getCategoryList()
{
    global $conn;
    $result = @mysql_query("Select * From categories", $conn);
    $ret = array();
    while($row = mysql_fetch_assoc($result))
    {
        $ret[] = $row;
    }
    return $ret;
}

=> output = null
Although database not null (ex: category(1, laptop, 500))
I think it wrong in $ret[] = $row;
Help me with

Answer 1

You have @mysql_query(.

Drop the @ :

$result = mysql_query("Select * From categories", $conn);