PHP中常见原生类的使用总结

$dateTime = new DateTime();
echo $dateTime->format('Y-m-d H:i:s');

$iterator = new FilesystemIterator('/path/to/directory');
foreach($iterator as $fileinfo) {
    echo $fileinfo->getFilename() . "\n";
}

$dsn = 'mysql:host=localhost;dbname=test';
$username = 'root';
$password = '';
try {
    $dbh = new PDO($dsn, $username, $password);
    $stmt = $dbh->prepare('SELECT * FROM users');
    $stmt->execute();
    while ($row = $stmt->fetch()) {
        echo $row['username'] . "\n";
    }
} catch (PDOException $e) {
    echo 'Connection failed: ' . $e->getMessage();
}

$data = [
    'name' => 'John',
    'age' => 25,
    'email' => 'john@example.com'
];
$jsonString = json_encode($data);
echo $jsonString;
$decodedData = json_decode($jsonString, true);
echo $decodedData['name']; // Output: John

class CustomSessionHandler implements SessionHandlerInterface {
    // Implement the required methods
}
$handler = new CustomSessionHandler();
session_set_save_handler($handler, true);
session_start();

$file = new SplFileObject('/path/to/file.txt', 'r');
while (!$file->eof()) {
    echo $file->fgets();
    $file->next();
}

$xml = '<book>
            <title>PHP Basics</title>
            <author>John Doe</author>
        </book>';
$simpleXML = new SimpleXMLElement($xml);
echo $simpleXML->title;
// Access XML elements using array syntax
echo $simpleXML['author'];

$zip = new ZipArchive();
$zipFileName = 'archive.zip';
$zip->open($zipFileName, ZipArchive::CREATE);
$zip->addFile('/path/to/file1.txt', 'file1.txt');
$zip->addFile('/path/to/file2.txt', 'file2.txt');
$zip->close();