What are the potential pitfalls when using mysqli_query and mysqli_fetch_array in PHP, especially when handling null values?

When using mysqli_query and mysqli_fetch_array in PHP, one potential pitfall is that null values may not be handled correctly. To address this issue, it is important to explicitly check for null values in the fetched data and handle them appropriately to avoid unexpected behavior or errors in your application. 

$query = "SELECT * FROM table_name";
$result = mysqli_query($connection, $query);

if ($result) {
    while ($row = mysqli_fetch_array($result)) {
        // Check for null values and handle them appropriately
        $value = ($row['column_name'] !== null) ? $row['column_name'] : 'N/A';
        
        // Process the data as needed
        echo $value . "\n";
    }
} else {
    echo "Error: " . mysqli_error($connection);
}

Keywords

mysqli_query mysqli_fetch_array null values data retrieval error handling

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