数组和DESC限制

Question

这是我的问题：

$q = 'SELECT * FROM s_stats WHERE srv_id='.$sid.' ORDER BY date DESC LIMIT 5';
$result = mysql_query($q) or die(mysql_error());
while ($row = mysql_fetch_array($result))
{
    if ($row[percent] == null) // don't work
        $procent[] = 1;
    else
        $procent[] = $row[percent];
}
$procent[] = implode('-', $procent);

Answer 1

可能if (! isset($row['percent']))代替if ($row['percent'] == null)

Answer 2

试

if ($row[percent] === null)

使用非严格==运算符时，0 == null和'' == null也会评估为true，这可能是不可取的。

Answer 3

尝试：if ($row["percent"] == null || $row["percent"] == "")

Answer 4

$q = 'SELECT * FROM s_stats WHERE srv_id='.$sid.' ORDER BY date DESC LIMIT 5';
$result = mysql_query($q) or die(mysql_error());
while ($row = mysql_fetch_array($result))
{
    echo '*', $row['percent'], '*<br/>';
    if (!isset($row["percent"]))
        $procent[] = 1;
    else
        $procent[] = $row[percent];
}
$procent[] = implode('-', $procent);

并打印：

12

4

66