如何在具有数百条记录的现有csv中添加新列并从数组中填充它？

Posted 2023-01-28

我正在尝试填充这样的csv文件。

existing.csv

header1 header2    header3  
record  record2    record3  
itemXYZ numberXYZ  item40   
data1   dataABC    anydata  
etcA    etc3       etcX5a
...

总行数= 522

记录和项目可以是任何字符串或数字。

要插入“ newHeader”的数据]]

array (size=522)
  0 => string 'Global' (length=6)
  1 => string 'Press' (length=6)
  2 => string 'Insurance' (length=9)
  3 => string 'Presse' (length=6)
  4 => string 'Insurance' (length=10)
  5 => string 'Global' (length=6)
  6 => string 'Assurances' (length=10)
  7 => string 'Global' (length=6)
  8 => string 'Global' (length=6)
  9 => string 'Global' (length=6)
 10 => ...
结果应该是这样的：

header1 header2    header3  newHeader
record  record2    record3  Global 
itemXYZ numberXYZ  item40   Press
data1   dataABC    anydata  Insurance,
etcA    etc3       etcX5a   Presse
...
[我在这里使用另一篇文章的稍加修改的代码（https://stackoverflow.com/a/36143377/11256861）。

foreach ($cat as $value) 
        writeToCsv($value);
   

function writeToCsv($value) 

$delimiter = ','; //your column separator
$csv_data = array();
$row = 1;
if (($handle = fopen('input/existing_populated.csv', 'r')) !== false) 
    while (($data = fgetcsv($handle, 1000, $delimiter)) !== false) 
        $csv_data[] = $data;
        $row++;
    
    fclose($handle);


$extra_columns = array('columnName' => $value);
foreach ($csv_data as $i => $data) 
    if ($i == 0) 
        $csv_data[$i] = array_merge($data, array_keys($extra_columns));
     else 
        $csv_data[$i] = array_merge($data, $extra_columns);
    


if (($handle = fopen('output/result.csv', 'w')) !== false) 
    foreach ($csv_data as $data) 
        fputcsv($handle, $data, $delimiter);
    
    fclose($handle);


最后，此方法使用从foreach循环读取的最新类别填充所有行。这是显而易见的。但是我不知道如何将每个类别从新列“分配”到现有记录。

谢谢您的帮助。

基于@bestprogrammerintheworld的解决方案

我做了一个小的修改。我的类别数组已经包含标题。我不知道这是否是最佳做法，但是很明显。感谢@bestprogrammerintheworld

$delimiter = ',';
$csv_data = array();
if (($handle = fopen('input/existing_populated.csv', 'r')) !== false) 
    while (($data = fgetcsv($handle, 1000, $delimiter)) !== false) 
        $csv_data[] = $data;
    
    fclose($handle);


$row = 0;
foreach ($cat as $index => $item) 
    if ($row === 0) 
        $csv_data[$index + $row][] = $item;
     else 
        $csv_data[$index + 1][] = $item;
    


//Save new array to csv
if (($handle = fopen('output/result.csv', 'w')) !== false) 
    foreach ($csv_data as $data) 
        fputcsv($handle, $data);
    
    fclose($handle);

我正在尝试填充这样的csv文件。 exist.csv header1 header2 header3 record record2 record3 itemXYZ numberXYZ item40 data1 dataABC anydata etcA etc3 ...

答案

<?php
$newHeader = array(
    'Global',
    'Press',
    'Insurance',
    'Presse',
    'Insurance',
    'Global',
    'Assurances',
    'Global'
);


//Load csv file
$delimiter = ';';
$csv_data = array();
$row = 1;
if (($handle = fopen('input/existing_populated.csv', 'r')) !== false) 
    while (($data = fgetcsv($handle, 1000, $delimiter)) !== false) 
        $csv_data[] = $data;
    
    fclose($handle);


/*
    Now the output of $csv_data looks something like:
    Array
    (
    [0] => Array
    (
        [0] => header1
        [1] => header2
        [2] => header3
    )

    [1] => Array
    (
        [0] => record
        [1] => record2
        [2] => record3
    )

    [2] => Array
    (
        [0] => itemXYZ
        [1] => numberXYZ
        [2] => item40
    )

    [3] => Array
        (
        [0] => data1
        [1] => dataABC
        [2] => anydata

*/

//Add header to array
$csv_data[0][] = 'newHeader'; (is [0][3] below)

/*
    Array
    (
    [0] => Array
    (
        [0] => header1
        [1] => header2
        [2] => header3
        [3] => newHeader
    )
*/

//Add data to array ($index is only viable here if $newHeader 
//is indexed by 0,1,2 etc)
/* $newHeader = array(
    'Global',
    'Press'...

    makes $newHeader[0] (Global), $newHeader1] Press etc...
 */
foreach($newHeader as $index=>$item) 
    $csv_data[$index + 1][] = $item;


//Save new array to csv
if (($handle = fopen('output/result.csv', 'w')) !== false) 
    foreach ($csv_data as $data) 
        fputcsv($handle, $data);
    
    fclose($handle);