echo "<tr><td>{$row['username']}</td><td>{$row['onoff']}</td><td>{$row['intime']}</td><td>";
if ($nowtime>=$syntime)
echo "<td style='color:red'>{$row['syntime']}</td>";
else
echo "<td>{$row['syntime']}</td>";
echo "</td><td>{$row['device']}</td><td>";
if ($row['a' ]== "无")
echo "<td style='color:red'>{$row['a']}</td>";
else
echo "<td>{$row['a']}</td>";
if ($row['b' == "无"])
echo "<td style='color:red'>{$row['a']}</td>";
else
echo "<td>{$row['b']}</td>";
echo "<td>{$row['person']}</td><td>{$row['dtime']}</td></tr>";
echo "<tr><td>{$row['username']}</td><td>{$row['onoff']}</td><td>{$row['intime']}</td>";
if ($nowtime>=$syntime)
echo "<td style='color:red'>{$row['syntime']}</td>";
else
echo "<td>{$row['syntime']}</td>";
echo "<td>{$row['device']}</td><td>";
if ($row['a' ]== "无")
echo "<td style='color:red'>{$row['a']}</td>";
else
echo "<td>{$row['a']}</td>";
if ($row['b'] == "无")
echo "<td style='color:red'>{$row['b']}</td>";
else
echo "<td>{$row['b']}</td>";
echo "<td>{$row['person']}</td><td>{$row['dtime']}</td></tr>";
纠正下
$a_style = $row['a'] == '无' ? ' styly="color:red"' : '';
$b_style = $row['b'] == '无' ? ' styly="color:red"' : '';echo "<tr><td>{$row['username']}</td><td>{$row['onoff']}</td><td>{$row['intime']}</td><td$syntime_style>{$row['syntime']}</td><td>{$row['device']}</td><td$a_style>{$row['a']}</td><td$b_style>{$row['b']}</td><td>{$row['person']}</td><td>{$row['dtime']}</td></tr>";