PHP脚本的空白页
[英]Blank Page with PHP script
问题描述
Im trying to get the input from a form and delete the table data then display the the updated table but i get a blank page I don't know what could be the problem any help would be appericiated here's my code: 
我试图从表单获取输入并删除表数据，然后显示更新后的表，但是我得到了一个空白页，我不知道这可能是什么问题，任何帮助都将适用于此，这是我的代码：
<html>
<body>
<?php
$mysqli = new mysqli("xxxxx", "xxxxxx", "xxxxx", "xxxxxx");
/* check connection */
if (mysqli_connect_errno()) {
printf("Connect failed: %s\n", mysqli_connect_error());
exit();
}
//----------------------------------------------------------------------------------//
$name = $_POST['Car_ID'];
if ($stmt = $mysqli->prepare("delete from CARS where name=?")) {
// Bind the variable to the parameter as a string.
$stmt->bind_param("s", $name);
// Execute the statement.
$stmt->execute();
echo "Deleted data successfully\n";
// Close the prepared statement.
$mysqli->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);
$result = $db->prepare("SELECT id, Doors, TRANSMISSION, Fuel_type, Engine_Size, Total FROM CARS");
$result->execute();
while ($row = $result->fetch(PDO::FETCH_ASSOC)){
$doors=$row["Doors"];
$engine=$row["Engine_Size"];
$total=$row["Total"];
$trans=$row["Transmission"];
}
?>
<table>
<tr>
<td><?php echo $doors; ?></td>
<td><?php echo $engine; ?></td>
<td><?php echo $total; ?></td>
<td><?php echo $trans; ?></td>
</tr>
<?php } ?>
</table>
</body>
</html>
3 个解决方案
解决方案1
5 已采纳 2014-04-14 15:49:13
You're mixing mysqli with PDO 您正在将mysqli与PDO混合使用
$mysqli->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);
and you're passing $db where it ( theoretically ) should be $mysqli 并且您正在传递$db （ 理论上应为$mysqli
$result = $db->prepare("SELECT id, Doors, TRANSMISSION, Fuel_type, Engine_Size, Total, DATE_INITIATED, AGE, PARTNO, QTY, DESCRIPTION, LOC FROM CARS");
where theoretically, it should be 理论上应该在哪里
$result = $mysqli->prepare("SELECT id, Doors, TRANSMISSION, Fuel_type, Engine_Size, Total, DATE_INITIATED, AGE, PARTNO, QTY, DESCRIPTION, LOC FROM CARS");
since your DB connection is: 因为您的数据库连接是：
$mysqli = new mysqli("xxxxx", "xxxxxx", "xxxxx", "xxxxxx");
However, your DB connection however should resemble: 但是，您的数据库连接应该类似于：
$mysql_hostname = 'xxx';
$mysql_username = 'xxx';
$mysql_password = 'xxx';
$mysql_dbname = 'xxx';
$db = new PDO("mysql:host=$mysql_hostname;dbname=$mysql_dbname", $mysql_username, $mysql_password);
$db->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);
You can't do this: 您不能这样做：
$stmt->bind_param("s", $name);
You're using PDO remember? 您使用PDO还记得吗？ ( or are you? ) Take your pick, is it mysqli or PDO? （ 还是您？ ）请选择，是mysqli还是PDO？
You most likely want to do: 您最有可能想要做：
// $stmt = $db->prepare("delete from CARS where name=:value");
if ($stmt = $db->prepare("delete from CARS where name=:value")) {
// Bind variables to your statement
$stmt->bindParam(':value', $name);
... }
解决方案2
2 2014-04-14 15:39:19
Have you enabled error_reporting? 您启用了error_reporting吗？
error_reporting(E_ALL);
ini_set("display_errors","on");
Add this to the head of your PHP File. 将此添加到您的PHP文件的头部。
解决方案3
0 2014-04-14 16:20:15
Great points made by @fred , when you finally decide which Database extensions you want to use, you will still have to fix the way you are outputting the table data, you should have the table tags outside of the loop, and you should be printing the table rows inside of the loop, watch out for extra braces. @fred的要点 ，当您最终决定要使用的数据库扩展名时，您仍然必须修复输出表数据的方式，应该将表标签置于循环之外，并且应该进行打印循环内的表行，请注意是否有多余的花括号。
something like this would work: 这样的事情会工作：
<html>
<body>
<table>
<?php
//Fetch your data
//.....
//....
while ($row = $result->fetch(PDO::FETCH_ASSOC)){
echo"<tr>
<td>$row['Doors']</td>
<td>$row['Engine_Size']</td>
<td>$row['Total']</td>
<td>$row['Transmission']</td>
</tr>";
}
?>
</table>
</body>
</html>
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