从零到10K！学习这些PHP开发技能，迎峰赢在起跑线

<?php
$name = "John";
$age = 25;

if ($age >= 18) {
    echo "Hello, " . $name . "!";
} else {
    echo "Sorry, you are not old enough.";
}
?>

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

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

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

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

if ($result->num_rows > 0) {
    while ($row = $result->fetch_assoc()) {
        echo "ID: " . $row["id"] . " - Name: " . $row["name"] . "<br>";
    }
} else {
    echo "No results found.";
}

$conn->close();
?>

// routes/web.php
Route::get('/hello', function () {
    return 'Hello, World!';
});

class Person {
    private $name;
    private $age;

    public function __construct($name, $age) {
        $this->name = $name;
        $this->age = $age;
    }

    public function getName() {
        return $this->name;
    }

    public function getAge() {
        return $this->age;
    }
}

$person = new Person("John", 25);
echo $person->getName(); // 输出：John
echo $person->getAge(); // 输出：25

$stmt = $conn->prepare("SELECT * FROM users WHERE username = ?");
$stmt->bind_param("s", $username);
$stmt->execute();
$result = $stmt->get_result();

while ($row = $result->fetch_assoc()) {
    echo $row["username"] . "<br>";
}

$stmt->close();
$conn->close();