Search Form with One or More (Multiple) Parameters

Question

I\'ve gotten the basics down, where I\'ve created two files, the search form where a user inputs search parameters, and the results file that cranks out inputted items. For

Answer 1

Build the WHERE clause dynamically. My recommended approach is to push each condition onto an array, and then use implode() to concatenate all the conditions, connecting them with AND or OR as is your preference.

$wheres = array();
$params = array();
if (!empty($_GET['id'])) {
    $wheres[] = 'a.uid = :uid';
    $params[':uid'] = $_GET['id'];
}
if (!empty($_GET['major'])) {
    $wheres[] = 'a.major = :major';
    $params[':major'] = $_GET['major'];
}
if (!empty($_GET['name'])) {
    $wheres[] = 'b.name LIKE :name';
    $params[':name'] = '%'.$_GET['name'].'%';
}
// And so on for all parameters

$sql = "SELECT * 
        FROM user_details AS a
        JOIN user AS b ON a.uid = b.id";
if (!empty($wheres)) {
    $sql .= " WHERE " . implode(' AND ', $wheres);
}
$stmt = $db->prepare($sql);
$stmt->execute($params);

Then display the results as in your original code.

while ($student = $stmt->fetch()) {
    ...
}