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要查询数据库并显示内容，可以使用PHP中的MySQLi扩展或PDO扩展。以下是一个简单的示例：
使用MySQLi扩展：
<?php $servername = "localhost"; $username = "username"; $password = "password"; $dbname = "database"; // 创建连接 $conn = new mysqli($servername, $username, $password, $dbname); // 检查连接是否成功 if ($conn->connect_error) { die("连接失败: " . $conn->connect_error); } // 查询数据 $sql = "SELECT id, name, email FROM users"; $result = $conn->query($sql); if ($result->num_rows > 0) { // 输出数据 while($row = $result->fetch_assoc()) { echo "id: " . $row["id"]. " - Name: " . $row["name"]. " - Email: " . $row["email"]. "<br>"; } } else { echo "0 结果"; } $conn->close(); ?> 使用PDO扩展：
<?php $servername = "localhost"; $username = "username"; $password = "password"; $dbname = "database"; try { $conn = new PDO("mysql:host=$servername;dbname=$dbname", $username, $password); $conn->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION); $stmt = $conn->prepare("SELECT id, name, email FROM users"); $stmt->execute(); // 设置结果集为关联数组 $result = $stmt->setFetchMode(PDO::FETCH_ASSOC); foreach($stmt->fetchAll() as $row) { echo "id: " . $row["id"]. " - Name: " . $row["name"]. " - Email: " . $row["email"]. "<br>"; } } catch(PDOException $e) { echo "Error: " . $e->getMessage(); } $conn = null; ?> 无论使用MySQLi扩展还是PDO扩展，都需要替换示例中的主机名、用户名、密码和数据库名以及查询的数据表和字段名称。
