我正在尝试使用 PHP 修改上传的 CSV 文件。更具体地说，我希望能够删除/删除列。
我有以下 CSV 文件（+100k 行）：
,news_headline,news_article,news_category
0,"50-year-old problem of biology solved by Artificial Intelligence"," DeepMind's AI system .....",technology
我想要做的是保存 CSV 文件的新副本，但仅包含列：news_headline和news_category.
这是我目前的设置
use League\Csv\Reader;
use League\Csv\Writer;
//Read in current file.
$path = 'data.csv';
$reader = Reader::createFromPath($path);
$headers = ['news_headline', 'news_category'];
$records = $reader->getRecords($headers);
//Create a new file (override)
$writer = Writer::createFromPath($path);
//Insert new records
$writer->insertAll($records);
上面的代码输出：
,news_headline
0,"50-year-old problem of biology solved by Artificial Intelligence"
我期待的地方：
news_headline,news_category
"50-year-old problem of biology solved by Artificial Intelligence", Technology