PHP を使用してデータベース内のデータの最初の数行をすばやく読み取るためのヒント

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

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

if ($conn->connect_error) {
    die("Connection failed: " . $conn->connect_error);
}

$sql = "SELECT * FROM table_name LIMIT 5";
$result = $conn->query($sql);

if ($result->num_rows > 0) {
    while($row = $result->fetch_assoc()) {
        echo "ID: " . $row["id"]. " - Name: " . $row["name"]. "<br>";
    }
} else {
    echo "0 results";
}

$conn->close();
?>

<?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 * FROM table_name");
    $stmt->execute();

    $result = $stmt->fetchAll();

    for($i=0; $i<5; $i++){
        echo "ID: ".$result[$i]["id"]." - Name: ".$result[$i]["name"]."<br>";
    }

} catch(PDOException $e) {
    echo "Error: " . $e->getMessage();
}
$conn = null;
?>

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

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

if ($conn->connect_error) {
    die("Connection failed: " . $conn->connect_error);
}

$sql = "SELECT * FROM table_name";
$result = $conn->query($sql);

$data = [];

if ($result->num_rows > 0) {
    while($row = $result->fetch_assoc()) {
        $data[] = $row;
    }
}

$first_five_rows = array_slice($data, 0, 5);

foreach ($first_five_rows as $row) {
    echo "ID: " . $row["id"]. " - Name: " . $row["name"]. "<br>";
}

$conn->close();
?>