正如標題所說，有人知道為什么圖片沒有上傳嗎？我正在嘗試制作一個 propic 圖片上傳頁面，但圖片沒有上傳。這是 HTML 表單：<form enctype="multipart/form-data" method="POST" action="../php/modifica-profilo.php"><!-- other inputs --><div class="form-group">    <label>Immagine profilo</label>    <input type="file" name="propic" class="form-control-file" accept="image/x-png,image/jpeg">    <small class="form-text text-muted">Solo immagini .png e .jpg - Dimensione massima 4 MB</small></div><div class="form-group">    <button class="btn btn-primary btn-block" type="submit" name="dettagliBtn">Salva modifiche</button></div>這是 php 腳本部分“modifica-profilo.php”：if(!empty($_POST['propic'])){            $dimensioneFile = $_FILES['propic']['size'];            $tipoFile = $_FILES['propic']['type'];            $tmp_name = $_FILES['propic']['tmp_name'];            $dir = "../img/propic-utenti/";            $estensione = image_type_to_extension(IMAGETYPE_PNG);            $estensione = image_type_to_extension(IMAGETYPE_JPEG);            $propic = md5($uid).$estensione;            if($dimensioneFile > 4000000){                echo "Il file è troppo grande";            }else{                move_uploaded_file($tmp_name,$dir.$propic);            }        }else{            $prendoPropic = "SELECT propic FROM clienti WHERE id='$uid';";            $rpp = $conn->query($prendoPropic);            $p = $rpp->fetch_assoc();            if($p['propic'] == "p-default.png"){                $propic = "p-default.png";            }else{                $propic = $p['propic'];            }        }        $aggiornodb = "UPDATE clienti SET cognome='$cognome', nome='$nome', email='$email', propic='$propic' WHERE id='$uid';";        $risultato = $conn->query($aggiornodb);