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

I'd do in this way.

function search_donar($_POST) {

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

    $search_query = "SELECT * FROM donar WHERE 1 = 1";
    if($by_name !="") {
      $search_query .= " AND name='$by_name'";
    }
    if($by_sex !="") {
      $search_query .= " AND sex='$by_sex'";
    }
    if($by_group !="") {
      $search_query .= " AND blood_group='$by_group'";
    }
    if($by_level !="") {
      $search_query .= " AND e_level='$by_level'";
    }
    $result = mysql_query($search_query);
    return $result;
}