PHP - MYSQL - test database server - php

Question

I'm learning PHP MYSQL and trying to create a database.
I'm following this tutorial
http://www.raywenderlich.com/2941/how-to-write-a-simple-phpmysql-web-service-for-an-ios-app
So far I'm testing to see if the server has access to MySQL. When I use the following code.
?php
class RedeemAPI {
private $db;
// Constructor - open DB connection
function __construct() {
$this->db = new mysqli('localhost', 'username', 'password', 'promos');
$this->db->autocommit(FALSE);
}
// Destructor - close DB connection
function __destruct() {
$this->db->close();
}
// Main method to redeem a code
function redeem() {
// Print all codes in database
$stmt = $this->db->prepare('SELECT id, code, unlock_code, uses_remaining FROM rw_promo_code');
$stmt->execute();
$stmt->bind_result($id, $code, $unlock_code, $uses_remaining);
while ($stmt->fetch()) {
echo "$code has $uses_remaining uses remaining!";
}
$stmt->close();
}
}
// This is the first thing that gets called when this page is loaded
// Creates a new instance of the RedeemAPI class and calls the redeem method
$api = new RedeemAPI;
$api->redeem();
?
I get the following error:
Warning: mysqli::mysqli() [mysqli.mysqli]: [2002] No such file or directory (trying to connect via unix:///var/mysql/mysql.sock) in /Users/user/Sites/promos/index.php on line 8
Warning: mysqli::mysqli() [mysqli.mysqli]: (HY000/2002): No such file or directory in /Users/user/Sites/promos/index.php on line 8
Warning: mysqli::autocommit() [mysqli.autocommit]: Couldn't fetch mysqli in /Users/user/Sites/promos/index.php on line 9
Warning: mysqli::prepare() [mysqli.prepare]: Couldn't fetch mysqli in /Users/user/Sites/promos/index.php on line 20
Fatal error: Call to a member function execute() on a non-object in /Users/user/Sites/promos/index.php on line 21
Did I perhaps forget to enable something?
It might explain why I cannot connect via my IP address to sequel pro and only to 127.0.0.1?

Answer 1

Apache servers use '127.0.0.1' instead of 'localhost'

Answer 2

There are two settings you have to check for this to work (assuming you have MySQL server installed of course):
Check the value of mysql.default_socket in your PHP configuration.
Check the value of socket in your MySQL configuration file under the [mysqld] heading.
Those values have to be identical; if they're not, change one to match the other and restart respective service.

Answer 3

This seems to be a common issue, as googling for it yields quite a few results. I experienced this on my two linux boxes as well (never under Windows though) and at some point I resolved to just use 127.0.0.1 on all dev servers. Basically, localhost makes the connection to the MySQL server use a socket, but your configuration doesn't point to the socket file correctly.
Here are a couple of resources that you might find useful:
http://westsworld.dk/blog/2011/03/problems-connecting-to-unixvarmysqlmysql-sock/ - basically what #Jack suggests, but more in depth
Can't connect to MySQL on Mac -- missing mysql.sock file - here's how to locate your socket file (for some reason, my php.ini had the path wrong, and I assume your case could be similar).
I hope this helps.