What are the potential pitfalls of using CSV files as databases in PHP, especially in terms of encoding and special characters?

Using CSV files as databases in PHP can lead to issues with encoding and special characters, as CSV files do not inherently support encoding other than ASCII. To avoid problems with special characters, it's important to properly handle encoding when reading and writing data to CSV files. One solution is to use functions like `utf8_encode()` and `utf8_decode()` to ensure proper encoding and decoding of data when working with CSV files.

// Read data from CSV file with proper encoding
$handle = fopen('data.csv', 'r');
while (($data = fgetcsv($handle)) !== false) {
    $encodedData = array_map('utf8_encode', $data);
    // Process data here
}
fclose($handle);

// Write data to CSV file with proper encoding
$handle = fopen('data.csv', 'w');
$data = ['Special characters: áéíóú', 'Encoding: UTF-8'];
$encodedData = array_map('utf8_decode', $data);
fputcsv($handle, $encodedData);
fclose($handle);