Connecting to a database from PHP
A PDO and mysqli connection example using localhost, and the most common connection errors.
Scripts running on your hosting connect to the database through the localhost host. You need the details from New MySQL database: the full database name, user and password.
PDO (recommended)#
php
<?php
$dsn = 'mysql:host=localhost;dbname=scyhost1_shop;charset=utf8mb4';
try {
$pdo = new PDO($dsn, 'scyhost1_user', 'PASSWORD', [
PDO::ATTR_ERRMODE => PDO::ERRMODE_EXCEPTION,
]);
} catch (PDOException $e) {
error_log($e->getMessage());
exit('Database connection error.');
}mysqli#
php
<?php
$db = new mysqli('localhost', 'scyhost1_user', 'PASSWORD', 'scyhost1_shop');
if ($db->connect_error) { error_log($db->connect_error); exit('Error.'); }
$db->set_charset('utf8mb4');Most common errors#
- Access denied for user: wrong password or the user was not added to the database. Check Current Databases in MySQL Databases.
- Unknown database: the account prefix is missing from the name.
- Could not find driver: the extension is not enabled, see PHP extensions.
Errors are written to a log, see PHP errors and logs.
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