Файлы и загрузки

$handle = fopen($path, 'w');
fwrite($handle, 'новые данные');
fclose($handle);

$handle = fopen($path, 'rb');
if ($handle === false) {
    throw new RuntimeException("Не удалось открыть $path");
}

$handle = fopen($counterFile, 'c+');
flock($handle, LOCK_EX);
$count = (int) stream_get_contents($handle);
ftruncate($handle, 0);
rewind($handle);
fwrite($handle, (string) ($count + 1));
flock($handle, LOCK_UN);
fclose($handle);

$uploadDir = '/srv/app/uploads';
chmod($uploadDir, 0777);

$path = '/srv/app/uploads/report.txt';
file_put_contents($path, $content);

if (is_writable($path)) {
    file_put_contents($path, $content);
}

$file = $_FILES['file'] ?? null;
if (!is_array($file) || ($file['error'] ?? UPLOAD_ERR_NO_FILE) !== UPLOAD_ERR_OK) {
    throw new RuntimeException('Загрузка не завершена');
}

if (($_FILES['file']['error'] ?? null) === UPLOAD_ERR_INI_SIZE) {
    throw new RuntimeException('Превышен upload_max_filesize');
}

$name = basename($_FILES['file']['name']);
move_uploaded_file($_FILES['file']['tmp_name'], $storage . '/' . $name);

$tmp = $_FILES['image']['tmp_name'];
$mime = (new finfo(FILEINFO_MIME_TYPE))->file($tmp);
$imageInfo = getimagesize($tmp);
if ($mime !== 'image/png' || $imageInfo === false) {
    throw new RuntimeException('Недопустимое изображение');
}