PHP select query on MS SQL SERVER 12

My client has a MS SQL Server 12 database table with a column - binary(8000)
It is populated with HashBytes('SHA1', '[concatenation of nvarchar entries of several other columns]').
Sample value is: 0x6C44CFB1C32C6E4ECDEBAC863FD5EA345681AC18

Using PHP 5.6.6, I collect the needed info to duplicate the concatenation described above and use the info to try to convert to an encryption to match the MS SQL SERVER 12 entry.
Nothing has worked yet  - I've tried many variations of a select statement like this one:
     $result="SELECT WebSiteEncryptedKey FROM Web.data where WebSiteEncryptedKey=HashBytes('SHA1',N'$webencryptedkey')";
     echo $result;
     echo "<br />";
     $rows = $db->query($result);
     if(!$rows)
     {
          die($db->errorInfo());
     } else {
          echo $rows; // line 102
     }
/*
RESULTS:
SELECT WebSiteEncryptedKey FROM Web.data where WebSiteEncryptedKey=HashBytes('SHA1',N'CURVATURESFP-10G-LR-CURV1154263')

Catchable fatal error: Object of class PDOStatement could not be converted to string in D:\inetpub\wwwroot\Registration.php on line 102
*/

Any help with doing this the correct way will be appreciated very much.
Thank you,
softexecware