Error on creating connection to PDO in PHP

Today, I removed and reinstalled the latest version of lampp in order to move to php 5.30, and suddenly a very simple app is failing to connect to the mysql database. I'm using PDO to connect, and receiving the following error:

Warning: PDO::__construct() [pdo.--construct]: [2002] Invalid argument (trying to connect 
via unix://) in /home/raistlin/www/todoapp/home.php on line 9

Fatal error: Uncaught exception 'PDOException' with message 'SQLSTATE[HY000] [2002]
Invalid argument' in /home/raistlin/www/todoapp/home.php:9 Stack trace: #0
/home/raistlin/www/todoapp/home.php(9): PDO->__construct('mysql:host=loca...', 'USER', 
'PASSWORD') #1 {main} thrown in /home/raistlin/www/todoapp/home.php on line 9

I am not catching the error at the moment, for the sake of debugging it.

The following code is enough to replicate the issue on my system:

<?php
$DBACCESS = array(
    "connstring"=>"mysql:host=localhost;dbname=todoapp",
    "host"=>"localhost",
    "user"=>"user",
    "password"=>"password",
    "todoapp"=>"todoapp"
    );

    echo implode('<br \>',$DBACCESS);

    $dbh = new PDO($DBACCESS['connstring'],$DBACCESS['user'],$DBACCESS['password']);

    $dbh = null;
?>

Looking online, I've found one or two other people with the same issue, but none of them have received a response, much less a working one. Does anyone know what is happening? Is there something I missed in the configuration? What do I need to do to fix it?

TML

Usually means that you need to specify TCP/IP (1), or tell MySQL where your Unix socket is (2):

"mysql:host=127.0.0.1" or "mysql:host=localhost;port=3306"
"mysql:unix_socket=/var/run/mysqld/mysqld.sock"

You can also use 127.0.0.1, rather than specifying "localhost", in your db connection string to avoid this issue altogether.

You might want to modify php.ini so PDO can find mysql.sock by specifying the pdo_mysql.default_socket = /opt/lampp/var/mysql/mysql.sock (in the case of xampp). Don't forget to restart Apache after changing php.ini.

(Sorry, this seems to be a repeated solution).

I'm using MAMP 2.0.1 and Symfony 1.4 with Doctrine for this project.

Third option worked for me with a small modification: in /config/databases.yml

dsn: 'mysql:unix_socket=/Applications/MAMP/tmp/mysql/mysql.sock;dbname=MY_DB_NAME;'

pilsetnieks

The most common cause of an error like this would be that MySQL isn’t running.

来源：https://stackoverflow.com/questions/1435445/error-on-creating-connection-to-pdo-in-php

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lampp