How can one troubleshoot issues with establishing a connection between IIS and MS SQL Server in PHP?

To troubleshoot issues with establishing a connection between IIS and MS SQL Server in PHP, ensure that the correct credentials are used, the SQL Server is configured to allow remote connections, and the necessary PHP extensions for SQL Server are enabled. Additionally, check for any firewall or network issues that may be blocking the connection. 

<?php
$serverName = "your_server_name";
$connectionOptions = array(
    "Database" => "your_database_name",
    "Uid" => "your_username",
    "PWD" => "your_password"
);

// Establishes the connection
$conn = sqlsrv_connect($serverName, $connectionOptions);

if($conn) {
    echo "Connection established.";
} else {
    echo "Connection could not be established.";
    die(print_r(sqlsrv_errors(), true));
}
?>

Keywords

IIS MS SQL Server PHP connection troubleshooting

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