PHP MySQL search with multiple criteria

Question

I have a search form in a website and would like to have several search terms which is input by the user to perform db search, terms as below:

• Keywords
• Pr

Answer 1

if(isset($_SESSION['login']))
{
 echo "
 Home |
 Signout|
 Profile
";


 }
 else
 {
    echo " ";
 }

$con=  mysql_connect("localhost","root","");
  $d=mysql_select_db("matrimonial",$con);
   $gender=$_POST['gender'];
  $age1=$_POST['age1'];
  $age2=$_POST['age2'];
  $city=$_POST['city'];
  $subcast=$_POST['subcast'];
  $result=mysql_query("select * from matri where gender='$gender' and age between '$age1' and '$age2' and city='$city' and subcast='$subcast'");

if($gender && !empty($gender))
{
 $result .= " AND `gender`='$gender'";
}

if($age1 && !empty($age1)){
        $result .= " AND `age`='$age1'";
    }   
 if($age2 && !empty($age2)){
       $result .= " AND `age`='$age2'";
    }  

 if($city && !empty($city)){
       $result .= " AND `city`='$city'";
    }  

  if($subcast && !empty($subcast)){
       $result .= " AND `subcast`='$subcast'";
    }  

   $result .= " select * from ";

   $sql = $mysql->query($result);
how to run this code