php 插入元素

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

// 创建连接
$conn = new mysqli($servername, $username, $password, $dbname);

// 检查连接
if ($conn->connect_error) {
    die("连接失败: " . $conn->connect_error);
}

$sql = "INSERT INTO users (firstname, lastname, email)
VALUES ('John', 'Doe', 'john@example.com')";

if ($conn->query($sql) === TRUE) {
    echo "新记录插入成功";
} else {
    echo "Error: " . $sql . "<br>" . $conn->error;
}

$conn->close();
?>

<?php
$array = array("apple", "banana");
array_push($array, "orange");
print_r($array);
?>

<?php
$data = "这是一些数据。\n";
$filename = "data.txt";
if (file_put_contents($filename, $data, FILE_APPEND) !== false) {
    echo "数据已成功写入文件";
} else {
    echo "写入文件失败";
}
?>