程序的目的是让用户从表单中选择一个国家，并显示您选择的国家中的所有博物馆，并在另一页中显示。
<?php
$museumDb = new PDO('sqlite:museums.db');
$query = $museumDb->prepare('SELECT * FROM museums');
$query->execute();
print '<pre><code>';
$museums = $query->fetchAll(PDO::FETCH_ASSOC);
print '</code></pre>';
?>
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<link href="style.css" type="text/css" rel="stylesheet">
<title>Museums</title>
</head>
<body>
<form action="result.php" method="POST">
<label for="country">Pick A Country:</label>
<select id="country" name="country">
<option value="" disabled selected="selected">---Pick a state---</option>
<option value="France">France</option>
<option value="Russia">Russia</option>
<option value="China">China</option>
<option value="United States">United States</option>
<option value="Vatican City">Vatican City</option>
<option value="Japan">Japan</option>
<option value="Mexico">Mexico</option>
<option value="United Kingdom">United Kingdom</option>
<option value="South Korea">South Korea</option>
<option value="Belgium">Belgium</option>
<option value="Israel">Israel</option>
<option value="Singapore">Singapore</option>
<option value="Italy">Italy</option>
<option value="Spain">Spain</option>
<option value="Egypt">Egypt</option>
<option value="Brazil">Brazil</option>
<option value="Austria">Austria</option>
<option value="Czech Republic">Czech Republic</option>
<option value="Germany">Germany</option>
<option value="Australia">Australia</option>
<option value="India">India</option>
<option value="Netherlands">Netherlands</option>
<option value="Canada">Canada</option>
<option value="Hungary">Hungary</option>
<option value="Switzerland">Switzerland</option>
<option value="Poland">Poland</option>
<option value="Taiwan">Taiwan</option>
<option value="Tunisia">Tunisia</option>
<option value="Norway">Norway</option>
<option value="UAE">UAE</option>
<option value="Greece">Greece</option>
</select>
<br>
<input type="submit" value="Submit">
</form>
<table>
<tr>
<th>ID#</th>
<th>Museum Name</th>
<th>Country</th>
</tr>
<?php foreach ($museums as $museum) : ?>
<tr>
<td><?php print $museum['museum_id']; ?></td>
<td><?php print $museum['museum_name']; ?></td>
<td><?php print $museum['country']; ?></td>
</tr>
<?php endforeach; ?>
</table>
</body>
</html>
这是应该根据所选择的国家/地区得出数据的页面，我真的不知道为什么不起作用，我是php的新手，所以我可能忽略了某些内容，如果能得到帮助，我将不胜感激。
<?php
require_once('index.php');
$countries = $_POST['country'];
$filterQuery ="SELECT museum_id,museum_name FROM museums WHERE country = ?";
$filter = $museumDb -> prepare($filterQuery);
$filter->bindParam('?',$countries);
$filter->execute();
?>
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Query results</title>
</head>
<body>
<table>
<tr>
<th>ID#</th>
<th>Museum Name</th>
<th>Country</th>
</tr>
<?php while($museumSearch = $filter->fetch(PDO::FETCH_OBJ)) {
print '<tr>';
print'<td>'.$museumSearch->museum_id.'</td>';
print'<td>'.$museumSearch->museum_name.'</td>';
print'<td>'.$museumSearch->country.'</td>';
print'</tr>';
}
?>
</table>
</body>
</html>
[当使用?作为占位符时，请在bindParam()中使用数字索引。
$filter->bindParam(0, $countries);
[在使用命名占位符时使用字符串索引。
$filterQuery ="SELECT museum_id,museum_name FROM museums WHERE country = :country";
$filter = $museumDb -> prepare($filterQuery);
$filter->bindParam(':country',$countries);