MySQL Inserting Problem with Ajax and Php

I have a photo that I capture with javascript and with ajax I send it to the php side. Then I can't save the photo to the file on the php side, there is no problem at this time, but it does not save it to the database.

Note that : When I check it, no error is returned, but it does not save to the database.

Javascript code :

        var canvas = document.getElementById("my-canvas");
        var photo = canvas.toDataURL('image/jpeg');                
        $.ajax({
          method: 'POST',
          url: 'photo_upload.php',
          data: {
          photo: photo
          }
        });

PHP Code :

if (isset($_POST['photo'])){
    $data = $_POST['photo'];
    if($data != "" || $data != null){
    list($type, $data) = explode(';', $data);
    list(, $data)      = explode(',', $data);
    $data = base64_decode($data);

    mkdir($_SERVER['DOCUMENT_ROOT'] . "/Proje/Dosyalar/HandDetection/photos");

    file_put_contents($_SERVER['DOCUMENT_ROOT'] . "/Proje/Dosyalar/HandDetection/photos/".time().'.jpeg', $data);
    die;

    //img db insert
    $handsImgQuery=$db->prepare("INSERT INTO detections SET
        detection_title=:detTitle,
        detection_time=:detTime,
        detection_photo=:detPhoto,
        det_email_status=:detEmailStatus
    ");

    $result=$handsImgQuery->execute(array(
        'detTitle' => "Hand Detection Image",
        'detTime' => date("Y-m-d h:i"),
        'detPhoto' => time()+".jpeg",
        'detEmailStatus' => true
    ));

    }
}

source https://stackoverflow.com/questions/70048585/mysql-inserting-problem-with-ajax-and-php