PDO是由Wez Furlong、George Schlossnagle、Ilia Alshanetsky、Marcus B?rger等人参与开发的一个PHP数据对象抽象层，跟PHP4中的DBX类似，支持多种数据库接口。目前工作在PHP5环境下，将来可能会绑定到PHP5中。
使用例子：
<?php
$dbh = new PDO('mysql:dbname=test;host=localhost', $username, $password);
// let's have exceptions instead of silence.
// other modes: PDO_ERRMODE_SILENT (default - check $stmt->errorCode() and $stmt->errorInfo())
// PDO_ERRMODE_WARNING (php warnings)
$dbh->setAttribute(PDO_ATTR_ERRMODE, PDO_ERRMODE_EXCEPTION);
// one-shot query
$dbh->exec("create table test(name varchar(255) not null primary key, value varchar(255));");
?>
<?php
// insert some data using a prepared statement
$stmt = $dbh->prepare("insert into test (name, value) values (:name, :value)");
// bind php variables to the named placeholders in the query
// they are both strings that will not be more than 64 chars long
$stmt->bindParam(':name', $name, PDO_PARAM_STR, 64);
$stmt->bindParam(':value', $value, PDO_PARAM_STR, 64);
// insert a record
$name = 'Foo';
$value = 'Bar';
$stmt->execute();
// and another
$name = 'Fu';
$value = 'Ba';
$stmt->execute();
// more if you like, but we're done
$stmt = null;
?>
<?php
// get some data out based on user input
$what = $_GET['what'];
$stmt = $dbh->prepare('select name, value from test where name=:what');
$stmt->bindParam('what', $what);
$stmt->execute();
// get the row using PDO_FETCH_BOTH (default if not specified as parameter)
// other modes: PDO_FETCH_NUM, PDO_FETCH_ASSOC, PDO_FETCH_OBJ, PDO_FETCH_LAZY, PDO_FETCH_BOUND
$row = $stmt->fetch();
print_r($row);
$stmt = null;
?>
更多的例子请访问Wez Furlong的BLOG。
