How to query multiple pieces of data in php

How to query multiple pieces of data in php: first create a PHP sample file; then create a PHP MySQL connection; finally, use the "SELECT id, firstname, lastname FROM MyGuests" statement to query multiple pieces of data.

The operating environment of this article: windows7 system, PHP7.1 version, DELL G3 computer

PHP MySQL native SQL query multiple data (MySQLi - Object-oriented)

<?php
$servername = "localhost";
$username = "username";
$password = "password";
$dbname = "myDB";
 
// 创建连接
$conn = new mysqli($servername, $username, $password, $dbname);
// Check connection
if ($conn->connect_error) {
    die("连接失败: " . $conn->connect_error);
} 
 
$sql = "SELECT id, firstname, lastname FROM MyGuests";
$result = $conn->query($sql);
 
if ($result->num_rows > 0) {
    // 输出数据
    while($row = $result->fetch_assoc()) {
        echo "id: " . $row["id"]. " - Name: " . $row["firstname"]. " " . $row["lastname"]. "<br>";
    }
} else {
    echo "0 结果";
}
$conn->close();
?>

[Recommended learning: PHP video tutorial][Recommended: MySQL video tutorial]

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