<?php

echo microtime(true);

?>

<?php

$servername = "localhost";

$username = "root";

$password = "";

// 创建连接

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

// 检测连接

if ($conn->connect_error) {

    die("连接失败: " . $conn->connect_error);

}

echo "连接成功";

?>

<?php

$servername = "localhost";

$username = "root";

$password = "";

try {

    $conn = new PDO("mysql:host=$servername;", $username, $password);

    echo "连接成功";

}

catch(PDOException $e)

{

    echo $e->getMessage();

}

?>