Error. Cannot connect to database: SQLSTATE[HYT00] - php

Question

I am getting the following error when trying to connect to my Microsoft SQL Server database using the default port number:
Error. Cannot connect to database: SQLSTATE[HYT00]: [unixODBC][Microsoft][ODBC Driver 17 for SQL Server]Login timeout expired
This is the PHP code I am using to connect to the database:
<?php
class DB_Connect {
private $db;
function construct() {
}
public function connect() {
require_once 'String.php';
try {
$this->db = new PDO('sqlsrv:Server=$server,1433; Database=$db', $user, $pass);
} catch (PDOException $e) {
return "Error. Cannot connect to database: " . $e->getMessage();
}
}
}
?>
I am 100% sure that the credentials are correct since they are workign when I run the script on localhost using xampp.
What I have done till now:
Installed the pdo drivers on the linux machine
Installed the obdc drivers on the linux machine
Installed the sqlsrv drivers on the linux machine
This is the configuration I am using on the server:
PHP Version 7.0.30 connecting to SQL Server 2017 hosted on Gearhost.
Can anyone please shed a light on what might be wrong?

Answer 1

Basically the issues were 2:
First of all, the drivers were not installed correctly. I needed to install the drivers through PECL. This is how I installed them on Redhat Cent OS 7:
Install PHP:
sudo su
wget https://dl.fedoraproject.org/pub/epel/epel-release-latest-7.noarch.rpm
wget http://rpms.remirepo.net/enterprise/remi-release-7.rpm
rpm -Uvh remi-release-7.rpm epel-release-latest-7.noarch.rpm
subscription-manager repos --enable=rhel-7-server-optional-rpms
yum-config-manager --enable remi-php72
yum update
yum install php php-pdo php-xml php-pear php-devel re2c gcc-c++ gcc
Install Prerequisites
sudo yum-config-manager --enable rhel-server-rhscl-7-rpms
sudo yum install devtoolset-7
scl enable devtoolset-7 bash
Install PHP Drivers for SQL Server
pecl download sqlsrv
tar xvzf sqlsrv-5.2.0.tgz
cd sqlsrv-5.2.0/
phpize
./configure --with-php-config=/usr/bin/php-config
make
sudo make install
Install Apache and restart the service
sudo yum install httpd
sudo apachectl restart
--EDIT--
You can alternatively download the prebuilt binaries from the Github project page, or install from the Remi repo:
sudo yum install php-sqlsrv php-pdo_sqlsrv
In my case I also had to open the firewall connection from the server the database. You check if this is necessary, run sqlcmd from Terminal to connect to the database. If you get a network error with the correct credentials, then you know you've got a firewall problem.
Hope this helps anyone who is struggling connecting to a Linux server to SQL Server.

Answer 2

Can you use this here?
try{
$db = new PDO("sqlsrv:Server,1433=$server;dbname=$db;charset=utf8","$user","$pass");
$query=$db->prepare("Some SQL String Here");
$query->execute();
}catch(PDOException $e ){
echo "Error: ".$e;
}