Why am I Getting Double Results When Fetching with PDO Prepared Statements?

PDO Problems with Prepared Statements Fetching Double Results

When utilizing a script for exporting data to a CSV file, you may encounter an issue where multiple copies of data are being displayed instead of the desired single row. This problem becomes evident when working with PDO prepared statements, and it can be confusing to understand why it occurs.

To resolve this issue, it's crucial to specify the desired format for the returned result. By default, PDO utilizes the FETCH_BOTH mode, which returns an array with both column names and 0-indexed column numbers. In your case, you want to retrieve only an associative array, which is indexed by column name.

To rectify this situation, simply modify your code by specifying the desired fetch mode:

while ($rows_get_rows = $result_get_rows->fetch(PDO::FETCH_ASSOC))
{
  $csv .= '"'.join('","', str_replace('"', '""', $rows_get_rows))."\"\n";
}

Alternatively, if you prefer a numerically indexed array, you can use PDO::FETCH_NUM instead.

The option you choose will determine the format of the returned result, ensuring that you receive the data in the desired structure for your CSV export.

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