用PHP将CSV的特定列保存到另一个CSV文件

$file = fopen('original.csv', 'r');
while (($data = fgetcsv($file)) !== false) {
    // 处理每行数据
}
fclose($file);

$selectedColumns = array(1, 3); // 要提取的列索引
$selectedData = array(); // 存储提取的数据

$file = fopen('original.csv', 'r');
while (($data = fgetcsv($file)) !== false) {
    $rowData = array(); // 存储当前行的特定列数据
    foreach ($selectedColumns as $columnIndex) {
        $rowData[] = $data[$columnIndex];
    }
    $selectedData[] = $rowData;
}
fclose($file);

$newFile = fopen('new.csv', 'w');
foreach ($selectedData as $rowData) {
    fputcsv($newFile, $rowData);
}
fclose($newFile);