好了，我只是把它改成$_POST，现在它工作了。我不确定这是否是快捷方法。至少它现在起作用了。如果你想帮我，可以帮我缩减代码。由于
<?php
$conn = new mysqli('localhost', 'root', 'jared17', 'hbadb')
or die ('Cannot connect to db');
$result = $conn->query("select * from english");
echo "<html>";
echo "<body>";
echo "<form method = POST>";
echo "<select name = 'Students'>";
while ($row = $result->fetch_assoc()) {
$LRN = $row['LRN'];
$Last = $row['Last_Name'];
$First = $row['First_Name'];
$Lvl = $row['Level'];
$Q1 = $row['Q1'];
$Q2 = $row['Q2'];
$Q3 = $row['Q3'];
$Q4 = $row['Q4'];
$Final = $row['FINAL'];
echo '<option value="'.$LRN.'|'.$Last.', '.$First.'|'.$Lvl.'|'.$Q1.'|'.$Q2.'|'.$Q3.'|'.$Q4.'|'. $Final.'">'.$Last.', '.$First.'</option>';
}
echo "</select>";
echo "<input type='submit' name='submit' value='Show'>";
echo "</form>";
$show = $_POST['Students'];
$show_explode = explode('|', $show);
echo "<table><tr><th>LRN</th><th>Name</th><th>Level</th><th>Q1</th><th>Q2</th><th>Q3</th><th>Q4</th><th>Final</th></tr>";
echo "<tr><td>". $show_explode[0]."</td><td>". $show_explode[1]."</td><td>". $show_explode[2]."</td><td>". $show_explode[3]."</td><td>". $show_explode[4]."</td><td>". $show_explode[5]."</td><td>". $show_explode[6]."</td><td>". $show_explode[7]."</td></tr>";
echo "</table>";
echo "</body>";
echo "</html>";
?>
不要把所有的细节都放在选项值中。只需在值中输入ID。
echo "<select name = 'Students'>";
while ($row = $result->fetch_assoc()) {
$LRN = $row['LRN'];
$Last = $row['Last_Name'];
$First = $row['First_Name'];
echo '<option value="'.$LRN.'">'.$Last.', '.$First.'</option>';
}
echo "</select>";
然后在提交表单时在数据库中查找。
if (isset($_POST['Students'])) {
$lrn = $_POST['Students'];
$stmt = $conn->prepare("SELECT Last_Name, First_Name, Level, Q1, Q2, Q3, Q4, FINAL FROM english WHERE LRN = ?");
$stmt->bind_param('i', $lrn);
$stmt->execute();
$stmt->bind_result($last, $first, $level, $q1, $q2, $q3, $q4, $final);
$stmt->fetch();
echo "<table><tr><th>LRN</th><th>Name</th><th>Level</th><th>Q1</th><th>Q2</th><th>Q3</th><th>Q4</th><th>Final</th></tr>";
echo "<tr><td>$lrn</td><td>$last, $first</td><td>$level</td><td>$q1</td><td>$q2</td><td>$q3</td><td>$q4</td><td>$final</td></tr></table";
}
在处理Array时可以使用$foreach来减少代码。这里的代码是
if(isset($_POST['submit'])){
// after post a form ur code goes here
$show = $_POST['Students']; $show_explode = explode('|', $show);
echo "<table><tr>
<th>LRN</th>
<th>Name</th>
<th>Level</th>
<th>Q1</th>
<th>Q2</th>
<th>Q3</th>
<th>Q4</th>
<th>Final</th>
</tr>";
echo "<tr>";
foreach($show_explode as $value){
echo "<td>".$value."</td>";
}
echo "</tr></table>
}