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In-depth analysis of PHP built-in objects: To explore the functions of built-in objects provided by PHP, specific code examples are required
As a commonly used server-side scripting language, PHP has built-in It contains many powerful objects that can help developers develop web applications more efficiently. In this article, we will take an in-depth analysis of PHP built-in objects, explore their functions and how to use them to improve programming efficiency.
$person = new stdClass(); $person->name = 'John Doe'; $person->age = 30; $person->getInfo = function () use ($person) { echo "Name: {$person->name}, Age: {$person->age}"; }; $person->getInfo(); // 输出:Name: John Doe, Age: 30
$now = new DateTime(); echo $now->format('Y-m-d'); // 输出当前日期,例如:2022-01-01 $birthday = new DateTime('1990-01-01'); $age = $now->diff($birthday)->y; echo "Age: {$age}"; // 输出:Age: 32
$fruits = new ArrayObject(['apple', 'banana', 'orange']); $fruits->append('kiwi'); $fruits->offsetUnset(1); foreach ($fruits as $fruit) { echo $fruit . ', '; // 输出:apple, orange, kiwi, }
function divide($dividend, $divisor) { if ($divisor == 0) { throw new Exception('Divisor cannot be zero'); } return $dividend / $divisor; } try { $result = divide(10, 0); echo "Result: {$result}"; } catch (Exception $e) { echo "Error: {$e->getMessage()}"; // 输出:Error: Divisor cannot be zero }
$dsn = 'mysql:host=localhost;dbname=test'; $user = 'root'; $pass = 'password'; try { $pdo = new PDO($dsn, $user, $pass); $stmt = $pdo->query('SELECT * FROM users'); while ($row = $stmt->fetch(PDO::FETCH_ASSOC)) { echo $row['name'] . ', '; // 输出:John Doe, Jane Smith, ... } } catch (PDOException $e) { echo "Error: {$e->getMessage()}"; }
The above is just the tip of the iceberg of PHP's built-in objects. PHP also provides many other useful built-in objects, such as SplFileObject, SimpleXMLElement, DOMDocument, and so on. By in-depth understanding and flexible use of these built-in objects, we can develop PHP programs more efficiently. I hope this article can help readers better grasp the functions and usage techniques of PHP's built-in objects.
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