php - 通过使用元素分组并通过另一个过滤来复制 CSV 文件

Question

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Answer 1

我可能会为此做两种不同的排序(假设我已经理解您的要求)。我创建了一个快速的 csv 编写器，您可能已经拥有它:

protected function saveToCsv($data, $path)
{
    $fp = fopen($path, 'w');

    foreach ($data as $fields) {
        fputcsv($fp, $fields);
    }

    fclose($fp);
}

筛选和排序脚本:

# Create a storage array
$new    =   [];
# Increment array to determine header row
$i      =   0;
# Turn the csv file to array
$array  =   array_map('str_getcsv', file('original.csv'));
# Sort low to high by the ID_project
usort($array, function($a, $b){
    return ($a[0] < $b[0]);
});
# Loop the array and just re-assign over the top of each instance of value
# which will eventually assign the last value (highest)
foreach($array as $row) {
    if($i == 0) {
        # Save header to put back into the copy csv
        $header =   $row;
        $i++;
        continue;
    }
    # Assign by id so the values are unique and sortable after
    if(!isset($new[$row[2]]))
        $new[$row[2]]   =   $row;
}
# Resort by the app_id
ksort($new);
# Save the new CSV somewhere with the header merged
$this->saveToCsv(array_merge([$header], $new), 'copy.csv');