使用PHP和PDO搜索表单，然后在页面上显示结果

Question

I am trying to search my SQL database with a simple search form and then return the data to the screen.

For example, the user can select a year, then all the row results from the table display all of the information for that entry. Here is my form:

<form class="" method="POST" action="availability.php"  enctype="multipart/form-data">

                    <select class="form-control mb-3"  name="year" id="year">
                      <option disabled selected>Year</option>
                      <option value="2019">2019</option>
                      <option value="2020">2020</option>
                      <option value="2021">2021</option>

                    </select>

                    <input class="btn btn-blue-grey" type="submit" value="submit">Search
                    <i class="fas fa-search ml-1"></i>
                    </input>

                    </form>

And here is my PHP

if(isset($_POST['submit'])) {

$year = $_POST['year'];

var_dump($year);
var_dump($_POST);

$sql = "SELECT * FROM availability WHERE year = :year";
$stmt = $pdo->prepare($sql);
$stmt->bindParam(':year',$year,PDO::PARAM_STR);
$stmt->setFetchMode(PDO::FETCH_ASSOC);
$stmt->execute();
$data = $stmt->fetchAll(); }

and my HTML

<ul>
                            <?php foreach($data as $stmt)  { ?>
                                <li><?php echo $stmt['cruise'];?></li>
                                <li><?php echo $stmt['year'];?></li>
                            <?php } ?>
                        </ul>

At the minute, the form submits, but I get nothing populating the list.. Any help would be appreciated.

Answer 1

You can try to use this query :

$year = $_POST['year'];
$sql = "SELECT * FROM availability WHERE year = :year";
$stmt = $pdo->prepare($sql);
$stmt->bindParam(':year',$year,PDO::PARAM_STR);
$stmt->setFetchMode(PDO::FETCH_ASSOC);
$stmt->execute();
$data = $stmt->fetchAll();

Answer 2

you must change a few thing, first, edit the select tag to:

<select class="form-control mb-3"  name="year" id="year">
                      <option disabled selected>Year</option>
                      <option value="2019">2019</option>
                      <option value="2020">2020</option>
                      <option value="2021">2021</option>

                    </select>

There is a condition that seems it is wrong. so, change your html code to

if($_POST) {

$year = $_POST['year'];

$stmt = $pdo->prepare("SELECT * FROM availability WHERE year = :year");
$stmt->execute(array("%$year%"));
// fetching rows into array
$data = $stmt->fetchAll();}

Answer 3

$stmt->bindParam(':year',$year,PDO::PARAM_STR); <-- does this need to be PARAM_INT ?

also have you var_dump'ed $year = $_POST['year']; to make sure you are getting a value?

You could turn on error_reporting and see if you get any useful errors