PHP怎么連接MySQL數(shù)據(jù)庫(kù)并獲取數(shù)據(jù)

要連接MySQL數(shù)據(jù)庫(kù)并獲取數(shù)據(jù)，你可以使用PHP中的mysqli擴(kuò)展或PDO擴(kuò)展。下面是一個(gè)示例代碼，演示如何連接MySQL數(shù)據(jù)庫(kù)并獲取數(shù)據(jù)：

1. 使用mysqli擴(kuò)展：

// 連接數(shù)據(jù)庫(kù)
$servername = "localhost";
$username = "username";
$password = "password";
$dbname = "database_name";

$conn = new mysqli($servername, $username, $password, $dbname);

// 檢查連接是否成功
if ($conn->connect_error) {
    die("Connection failed: " . $conn->connect_error);
}

// 查詢數(shù)據(jù)
$sql = "SELECT * FROM table_name";
$result = $conn->query($sql);

// 輸出查詢結(jié)果
if ($result->num_rows > 0) {
    while($row = $result->fetch_assoc()) {
        echo "id: " . $row["id"]. " - Name: " . $row["name"]. "<br>";
    }
} else {
    echo "0 results";
}

// 關(guān)閉連接
$conn->close();

2. 使用PDO擴(kuò)展：

// 連接數(shù)據(jù)庫(kù)
$servername = "localhost";
$username = "username";
$password = "password";
$dbname = "database_name";

try {
    $conn = new PDO("mysql:host=$servername;dbname=$dbname", $username, $password);
    $conn->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);
    
    // 查詢數(shù)據(jù)
    $stmt = $conn->prepare("SELECT * FROM table_name");
    $stmt->execute();
    
    // 輸出查詢結(jié)果
    $result = $stmt->fetchAll();
    foreach($result as $row) {
        echo "id: " . $row["id"]. " - Name: " . $row["name"]. "<br>";
    }
} catch(PDOException $e) {
    echo "Connection failed: " . $e->getMessage();
}

// 關(guān)閉連接
$conn = null;

以上是使用mysqli擴(kuò)展和PDO擴(kuò)展連接MySQL數(shù)據(jù)庫(kù)并獲取數(shù)據(jù)的示例代碼。你可以根據(jù)自己的實(shí)際情況選擇其中一種來使用。