Choosing an API

PHP offers different APIs to connect to MySQL. Below we show the APIs provided by the mysqli and PDO extensions. Each code snippet creates a connection to a MySQL server running on "example.com" using the username "user" and the password "password". And a query is run to greet the user.

示例 #1 Comparing the MySQL APIs

<?php
// mysqli
$mysqli = new mysqli("example.com", "user", "password", "database");
$result = $mysqli->query("SELECT 'Hello, dear MySQL user!' AS _message FROM DUAL");
$row = $result->fetch_assoc();
echo htmlentities($row['_message']);

// PDO
$pdo = new PDO('mysql:host=example.com;dbname=database', 'user', 'password');
$statement = $pdo->query("SELECT 'Hello, dear MySQL user!' AS _message FROM DUAL");
$row = $statement->fetch(PDO::FETCH_ASSOC);
echo htmlentities($row['_message']);

示例 #2 Comparing prepared statements

<?php
// mysqli
$mysqli = new mysqli("example.com", "user", "password", "database");
$statement = $mysqli->prepare("SELECT District FROM City WHERE Name=?");
$statement->execute(["Amersfoort"]);
$result = $statement->get_result();
$row = $result->fetch_assoc();
echo htmlentities($row['District']);

// PDO
$pdo = new PDO('mysql:host=example.com;dbname=database', 'user', 'password');
$statement = $pdo->prepare("SELECT District FROM City WHERE Name=?");
$statement->execute(["Amersfoort"]);
$row = $statement->fetch(PDO::FETCH_ASSOC);
echo htmlentities($row['District']);

Feature comparison

The overall performance of both extensions is considered to be about the same. Although the performance of the extension contributes only a fraction of the total run time of a PHP web request. Often, the impact is as low as 0.1%.

	ext/mysqli	PDO_MySQL
PHP version introduced	5.0	5.1
Included with PHP 7.x and 8.x	Yes	Yes
Development status	Active	Active
Lifecycle	Active	Active
Recommended for new projects	Yes	Yes
OOP Interface	Yes	Yes
Procedural Interface	Yes	No
API supports non-blocking, asynchronous queries with mysqlnd	Yes	No
Persistent Connections	Yes	Yes
API supports Charsets	Yes	Yes
API supports server-side Prepared Statements	Yes	Yes
API supports client-side Prepared Statements	No	Yes
API supports Stored Procedures	Yes	Yes
API supports Multiple Statements	Yes	Most
API supports Transactions	Yes	Yes
Transactions can be controlled with SQL	Yes	Yes
Supports all MySQL 5.1+ functionality	Yes	Most