What are some common mistakes that beginners make when trying to manipulate CSV data using PHP?

One common mistake beginners make when manipulating CSV data using PHP is not properly handling the data when reading or writing to the file. It's important to use the correct functions for parsing CSV data and to handle any errors that may occur during the process. Additionally, beginners may forget to close the file handle after reading or writing, which can lead to memory leaks or other issues.

// Correct way to read CSV data and handle errors
$filename = 'data.csv';
if (($handle = fopen($filename, 'r')) !== false) {
    while (($data = fgetcsv($handle)) !== false) {
        // Process CSV data here
    }
    fclose($handle);
} else {
    echo "Error opening file";
}