linux 找不到上传文件

sudo mkdir -p /path/to/upload/directory
sudo chown -R www-data:www-data /path/to/upload/directory
sudo chmod -R 755 /path/to/upload/directory

df -h /tmp
sudo mkdir -p /tmp
sudo chown -R www-data:www-data /tmp
sudo chmod -R 777 /tmp

sudo chown -R www-data:www-data /path/to/upload/directory
sudo chmod -R 755 /path/to/upload/directory

<?php
if (isset($_FILES['file'])) {
    $fileTmpPath = $_FILES['file']['tmp_name'];
    $fileName = $_FILES['file']['name'];
    $uploadFileDir = '/path/to/upload/directory/';
    $destFilePath = $uploadFileDir . $fileName;

    if (move_uploaded_file($fileTmpPath, $destFilePath)) {
        echo "File uploaded successfully.";
    } else {
        echo "Failed to move uploaded file.";
    }
} else {
    echo "No file uploaded.";
}
?>