php连接mysql搜索

<?php
$servername = "localhost";
$username = "username";
$password = "password";
$dbname = "database_name";

try {
    // 创建PDO连接
    $conn = new PDO("mysql:host=$servername;dbname=$dbname", $username, $password);
    // 设置PDO错误模式为异常
    $conn->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);

    // 准备SQL语句
    $stmt = $conn->prepare("SELECT * FROM users WHERE username LIKE :username");
    $username = "%search_term%";
    $stmt->bindParam(':username', $username);

    // 执行SQL语句
    $stmt->execute();

    // 获取结果集
    $result = $stmt->fetchAll(PDO::FETCH_ASSOC);

    // 输出结果
    foreach ($result as $row) {
        echo "ID: " . $row['id'] . " - Username: " . $row['username'] . "<br>";
    }
} catch (PDOException $e) {
    echo "Error: " . $e->getMessage();
}

// 关闭连接
$conn = null;
?>