Are there any best practices for file copying in PHP to ensure efficiency and security?

When copying files in PHP, it is important to ensure both efficiency and security. To improve efficiency, it is recommended to use PHP's built-in functions like `copy()` or `file_get_contents()` and `file_put_contents()` for smaller files. For larger files, consider using `stream_copy_to_stream()` for better performance. To enhance security, always validate user input and sanitize file paths to prevent directory traversal attacks. 

// Example of secure and efficient file copying in PHP
$sourceFile = 'path/to/source/file.txt';
$destinationFile = 'path/to/destination/file.txt';

// Validate user input and sanitize file paths
if (is_file($sourceFile) && strpos($sourceFile, '../') === false) {
    // Copy the file using PHP's built-in function
    if (copy($sourceFile, $destinationFile)) {
        echo 'File copied successfully.';
    } else {
        echo 'Failed to copy file.';
    }
} else {
    echo 'Invalid file path.';
}

Keywords

file copying PHP efficiency security best practices

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