What potential pitfalls should be considered when dynamically reading and outputting CSV data in PHP?

One potential pitfall when dynamically reading and outputting CSV data in PHP is the risk of encountering malicious input such as code injection or cross-site scripting attacks. To mitigate this risk, it is essential to properly sanitize and validate the CSV data before outputting it to the browser. This can be achieved by using functions like htmlspecialchars() to escape special characters and prevent script execution. 

// Read CSV data
$csvData = file_get_contents('data.csv');

// Sanitize and output CSV data
$lines = str_getcsv($csvData, "\n");

foreach ($lines as $line) {
    $data = str_getcsv($line);

    foreach ($data as $value) {
        echo htmlspecialchars($value) . ', ';
    }

    echo '<br>';
}

Keywords

fgetcsv fopen error handling memory management data validation

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