Split CSV file into 6 mb files - php

Question

I am trying to divide CSV file into 6mb files. Following is the code I have tried.
$file = 'upload/L_10001_20200916183801.csv';
$files = SplitCSVBySize($file, 10001);
function SplitCSVBySize($Existingfiles, $AccountId, $splitSize = "") {
$fh = fopen($Existingfiles, 'r');
$headers = fgetcsv($fh);
$files = array();
$filepath = 'upload/' . 'L_' . $AccountId . '_' . date('YmdHis') . '.csv';
$files[] = $filepath;
$currentFile = $filepath;
$outputFile = fopen($filepath, 'w');
fputcsv($outputFile, $headers);
$rows = 0;
while (!feof($fh)) {
if ($row = $rowPri = fgetcsv($fh))
{
if(filesize($filepath) < 6000000){
fputcsv($outputFile, $row);
} else {
fclose($outputFile);
$rows = 0;
$filepath = 'upload/' . 'L_' . $AccountId . '_' . date('YmdHis') . '.csv';
$files[] = $filepath;
$currentFile = $filepath;
$outputFile = fopen($filepath, 'w');
fputcsv($outputFile, $headers);
fputcsv($outputFile, $row);
}
$rows++;
}
}
fclose($outputFile);
fclose($fh);
return $files;
}
Here challenge is I am not able to check filesize because It always returns same size as it was at very first check. Plese help here, what is wrong or any suggestion.

Answer 1

First of all. function filesize (as well as all other derivatives from stat) is cached. That means, once called on some file, its result will remain the same for the same file.
You need to call clearstatcache() prior to calling this function, to clear the cache.
Second. You don't need to call filesize to obtain the size of the opened file.
You can call fstat on the opened file handle and use 'size' item of the returned array . E.g.:
...
$st = filestat($outputFile);
if($st['size'] < 6000000){
...
And at last you don't need to know size of the file, since you have current file position which is, when writing to the file, equals to its size. You can use ftell to obtain that. I.e.
...
if (ftell($outputFile) < 6000000) {
...