PHP使用出现 Fatal error: Class 'SQLite3' not found

<?php

//phpinfo();
/**
* Simple example of extending the SQLite3 class and changing the __construct
* parameters, then using the open method to initialize the DB.
*/

class MyDB extends SQLite3
{
function __construct()
{
$this->open('test.db');
}
}

$db = new MyDB();

$db->exec('CREATE TABLE foo (bar STRING)');
$db->exec("INSERT INTO foo (bar) VALUES ('This is a test')");

$result = $db->query('SELECT bar FROM foo');
var_dump($result->fetchArray());

?>

Class 'SQLite3' not found in

需要在php.ini中修改下面的配置

extension_dir = "C:/php/php7.0/ext"

extension=php_pdo_sqlite.dll
extension=php_sqlite3.dll
sqlite3.extension_dir = "C:/php/php7.0/ext"