PHP连接到MS SQL Server 2008 R2不成功

Question

Using MS SQL Server 2008 R2:

<?PHP
    $servername = "";    //serverName\instanceName
//  $username = "";    // exclude UID, using windows authentication
//  $password = "";    // exclude PWD, using windows authentication
    $connectionInfo = array("Database"=>"db.mdf");
    $conn = sqlsrv_connect($serverName, $connectionInfo);
    if( $conn ) {
         echo "Connection established.<br />";
    }else{
         echo "Connection could not be established.<br />";
         die( print_r( sqlsrv_errors(), true));
    }
?>

Notice: Undefined variable: serverName in C:\\OES\\test.php on line 97 Call Stack: 0.0270 336232 1. {main}() C:\\OES\\test.php:0 Connection could not be established.

Please help me fix the connection.

Answer 1

Variable names in PHP are case sensitive

Variables in PHP are represented by a dollar sign followed by the name of the variable. The variable name is case-sensitive. ¹

So change the variable name in either the first line or the 4th line to match the other:

$servername = "serverName\instanceName";    //serverName\instanceName
$conn = sqlsrv_connect($servername , $connectionInfo);

Also the database name sent to sqlsrv_connect should not have the file name - remove the extension (ie .mdf ):

$connectionInfo = array("Database"=>"my_db");