php删除大文件

function deleteLargeFile($filePath) {
    $chunkSize = 1024 * 1024; // 1MB
    $fileHandle = fopen($filePath, 'r');
    if ($fileHandle) {
        while (!feof($fileHandle)) {
            fread($fileHandle, $chunkSize);
        }
        fclose($fileHandle);
    }
    unlink($filePath);
}

function deleteFileWithPermissionCheck($filePath) {
    if (is_writable($filePath)) {
        unlink($filePath);
    } else {
        throw new Exception("Permission denied to delete file: " . $filePath);
    }
}

function deleteFileIfExists($filePath) {
    if (file_exists($filePath)) {
        unlink($filePath);
    } else {
        echo "File does not exist: " . $filePath;
    }
}