php网站制作常用代码

<?php
echo "Hello, World!";
?>

<?php
if ($_SERVER["REQUEST_METHOD"] == "POST") {
    $name = htmlspecialchars($_POST['name']);
    echo "Hello, $name!";
}
?>
<form method="post" action="<?php echo htmlspecialchars($_SERVER["PHP_SELF"]);?>">
Name: <input type="text" name="name">
<input type="submit">
</form>

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

// 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);
}
echo "连接成功";
?>

<?php
session_start();

if (isset($_SESSION['views'])) {
    $_SESSION['views'] = $_SESSION['views'] + 1;
} else {
    $_SESSION['views'] = 1;
}
echo "页面访问量: " . $_SESSION['views'];
?>