Código PHP:
<?php
//**** conexion a una base de datos SQL
echo phpinfo();
$conectID = mssql_connect("host","user","pass");
mssql_select_db("merkalink");
$result=mssql_query("select Login from Tabla" );
if ($result){
echo "true";
}else{
echo "false";
}
mssql_close($conectID);
?>