Edit CSV Converting Rows into Columns [closed] - php

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I am using Windows and working with CSV/XLS data. I have a data that need to edit with PHP, but I'm not sure how.
Here is sample the data:
code1,data1
D0001,X1235466
D0002,X1232265
D0003,X1235166
D0004,X5235466
D0005,X6232265
D0006,X7235166
.. and so on--about 20,000 lines.
I am trying to make the file look like this:
code1,data1,code2,data2,code3,data3
D0001,X1235466,D0002,X1232265,D0003,X1235166
D0004,X5235466,D0005,X6232265,D0006,X7235166
and so on, then save it to new CSV file. Thanks.

Answer 1

Alright, I was bored, so I wrote this. You really need to attempt writing the code before posting the question, though, and show your work.
Here goes:
<?php
$desiredColumns = 3;
$inputFd = fopen('data.csv', 'r');
$outputFd = fopen('output.csv', 'w');
$buffer = [];
// Write the CSV header.
fputcsv($outputFd, [
'code1', 'data1', 'code2', 'data2','code3', 'data3'
]);
//Skip header line.
fgetcsv($inputFd);
while (!feof($inputFd)) {
$line = fgetcsv($inputFd);
if (empty($line) || empty($line[0])) {
continue;
}
$line = array_map('trim', $line);
$buffer[] = $line;
// If our buffer has $desiredColumns in it, flush the buffer
// to our output file.
if (count($buffer) == $desiredColumns) {
outputCsv($outputFd, $buffer);
$buffer = [];
}
}
// If we had a total number of entries that is not a multiple
// of 3, we need to output the remaining records.
if (!empty($buffer)) {
outputCsv($outputFd, $buffer);
}
// Function for flushing a record buffer to the output file.
function outputCsv($outputFd, $buffer)
{
$outputData = [];
foreach ($buffer as $record) {
$outputData[] = $record[0];
$outputData[] = $record[1];
}
fputcsv($outputFd, $outputData);
}
Now, as an example of this being run:
$ cat data.csv
code1,data1
D0001,X1235466
D0002,X1232265
D0003,X1235166
D0004,X5235466
D0005,X6232265
D0006,X7235166
$ php so.php
$ cat output.csv
code1,data1,code2,data2,code3,data3
D0001,X1235466,D0002,X1232265,D0003,X1235166
D0004,X5235466,D0005,X6232265,D0006,X7235166