What are the drawbacks of using fetchColumn() directly to display JSON data to clients in PHP applications?

Using fetchColumn() directly to display JSON data to clients in PHP applications can lead to potential security vulnerabilities, as it does not properly encode the data. To mitigate this risk, you should encode the fetched data using json_encode() before sending it to the client. This ensures that the data is properly formatted and safe to be displayed. 

$stmt = $pdo->prepare("SELECT json_column FROM table");
$stmt->execute();
$data = $stmt->fetchColumn();

// Encode the fetched data before sending it to the client
echo json_encode($data);

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fetchColumn JSON data clients PHP applications drawbacks

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