I installed linux in my machine, and php was there so I installed it, 
then later on I installed mysql, but now I can connect to my mysql
database through php, what could I have done wrong the error am 
getting is :

Fatal errror: call to unsupported or undefined function session_start() 
/home/httpd/ff.php3 on line 7

this the code of my php program
<html>

<body>

 <?php

   $db = mysql_connect("localhost", "root");

if (!$db) {
     echo  "An error occured.\n";
     exit;
}


   mysql_select_db("mymarket",$db);

   $result = mysql_query("SELECT * FROM employees",$db);

     printf("First Name: %s<br>\n", mysql_result($result,0,"first"));
     printf("Last Name: %s<br>\n", mysql_result($result,0,"last"));
     printf("Address: %s<br>\n", mysql_result($result,0,"address"));
     printf("Position: %s<br>\n", mysql_result($result,0,"position"));
  
  ?>

</body>
</html>


Please assist
Thanks Martin