MySQLi connect

Object oriented style

Connect to Server

$conn = new mysqli("localhost","my_user","my_password");

Set the default database: $conn->select_db("my_db");

Connect to Database

$conn = new mysqli("localhost","my_user","my_password","my_db");

Procedural style

Connect to Server

$conn = mysqli_connect("localhost","my_user","my_password");

Set the default database: mysqli_select_db($conn, "my_db");

Connect to Database

$conn = mysqli_connect("localhost","my_user","my_password","my_db");

Verify Database Connection

Object oriented style

if ($conn->connect_errno > 0) {
    trigger_error($db->connect_error);
} // else: successfully connected

Procedural style

if (!$conn) {
   trigger_error(mysqli_connect_error());
} // else: successfully connected

Found a mistake? Have a question or improvement idea? Let me know.

Table Of Contents