Question

I am getting an error: Fatal error: Uncaught exception 'PDOException' with message 'SQLSTATE[HY000] [2002] Can't connect to local MySQL server through socket '/var/lib/mysql/mysql.sock' (2)' in /home/content/........

Althought if I do it in one file, it works fine!

My php file:

<?php
require 'includes/dbc.php';

$dbc = new dbc();
$db = $dbc->openDb();
$stmt = $dbc->getAllUsers($db);

while ($row = $stmt->fetch(PDO::FETCH_ASSOC)) {
    echo $row['iduser'];
}
?>

my database class:

<?php

class dbc {

    public $dbserver = '';
    public $dbusername = '';
    public $dbpassword = '';
    public $dbname = '';

    function openDb() {

        $db = new PDO('mysql:host=' . $dbserver . ';dbname=' . $dbname . ';charset=utf8', '' . $dbusername . '', '' . $dbpassword . '');
        return $db;
    }

    function getAllUsers($db) {
        $stmt = $db->query("SELECT * FROM user");
        return $stmt;
    }
}

?>

Answer 1

In the sample-code you provided, you’re not specifying a database, user, password or host to the database connection string:

function openDb() {
    $db = new PDO('mysql:host=' . $dbserver . ';dbname=' . $dbname . ';charset=utf8', '' . $dbusername . '', '' . $dbpassword . '');
    return $db;
}

With invalid data, your code cannot connect and therefore you’re receiving the connection-error.

As they’re global to the dbc class, you’ll need to use $this when accessing them (such as $this->dbserver). Try updating your code to:

function openDb() {
    $db = new PDO('mysql:host=' . $this->dbserver . ';dbname=' . $this->dbname . ';charset=utf8', '' . $this->dbusername . '', '' . $this->dbpassword . '');
    return $db;
}

* Also, though you may have removed it to post the question, you don’t have any of those variables set to actual values either.