What best practices should be followed when reading and processing CSV files in PHP for database import?

When reading and processing CSV files in PHP for database import, it is important to handle errors gracefully, validate the data, sanitize input to prevent SQL injection, and optimize performance by using batch inserts instead of individual queries.

// Example code snippet for reading and processing CSV files for database import
$csvFile = 'data.csv';
$handle = fopen($csvFile, 'r');

if ($handle !== false) {
    while (($data = fgetcsv($handle, 1000, ',')) !== false) {
        // Process and validate data here
        // Sanitize input to prevent SQL injection
        // Perform batch inserts into the database
    }

    fclose($handle);
} else {
    echo "Error opening file.";
}