Search Filtering with PHP/MySQL

Question

I\'m trying to create a search/filtering option in my blood donor application. Where donor can be searched by sex, name, blood group or by selecting all three. Here is my code

Answer 1

Try like this:

function search_donar($_POST) {

        $by_name = $_POST['by_name'];
        $by_sex = $_POST['by_sex'];
        $by_group = $_POST['by_group'];
        $by_level = $_POST['by_level'];

        $isfirst=0;
        $search_query = "SELECT * FROM donar WHERE";
        if($by_name !="") {

          $search_query .= " name='$by_name'";
          $isfirst=1;
        }
        if($by_sex !="") {
            if($isfirst!=0)
            $search_query .= " AND ";
          $search_query .= " sex='$by_sex'";
          $isfirst=1;
        }
        if($by_group !="") {
            if($isfirst!=0)
            $search_query .= " AND ";
          $search_query .= " blood_group='$by_group'";
          $isfirst=1;
        }
        if($by_level !="") {
            if($isfirst!=0)
            $search_query .= " AND ";
          $search_query .= " e_level='$by_level'";
          $isfirst=1;
        }
        $result = mysql_query($search_query);

        return $result;
    }