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

In this where you don't use validation, it is recomended not to use whether Field is EMPTY or NOT. Try below code, Hope it will work

function search_donar($_POST) {

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

    $search_query = "SELECT * FROM donar WHERE name LIKE '%$by_name%' AND sex LIKE '%$by_sex%' AND blood_group LIKE '%$by_group%' AND  e_level LIKE '%$by_level%' ";

    $result = mysql_query($search_query);

    return $result;
}