<?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();
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