Remove or Replace last row of a CSV file with PHP - php

Question

I am trying to update last line of a csv file, I get the last line with using this code:
$f = public_path('MYCSV.csv');
$rows = file($f);
$last_row = array_pop($rows);
$data = str_getcsv($last_row);
I searched a lot but did not find any way to replace or at least to remove the last line of csv file, it will be great if do not use foreach loop as the file size is big...

Answer 1

Code: (I don't have Laravel to test on, but I tested with raw php)
$f = public_path('MYCSV.csv');
$rows = file($f);
array_pop($rows); // remove final element/row from $array
file_put_contents($f, implode($rows)); // convert back to string and overwrite file
Now if you want to add a new row to the end of your file, you will just need to push the new data as a comma-separated string (with a trailing newline character) into the $rows array.
If you have a .csv file with this content:
Sally Whittaker,2018,McCarren House,312,3.75
Belinda Jameson,2017,Cushing House,148,3.52
Jeff Smith,2018,Prescott House,17-D,3.20
Sandy Allen,2019,Oliver House,108,3.48
Then $rows array, after the array_pop() call, will be:
array (
0 => 'Sally Whittaker,2018,McCarren House,312,3.75
',
1 => 'Belinda Jameson,2017,Cushing House,148,3.52
',
2 => 'Jeff Smith,2018,Prescott House,17-D,3.20
')
*Notice that the newline characters are not lost when file() is used -- so no "glue" is necessary with implode().
After file_put_contents() is called, the file will be overwritten with:
Sally Whittaker,2018,McCarren House,312,3.75
Belinda Jameson,2017,Cushing House,148,3.52
Jeff Smith,2018,Prescott House,17-D,3.20

Answer 2

<?php try {
$csv_path = 'MYCSV.csv';
$fp = fopen($csv_path, 'r+');
if ($fp) {
$data = array();
while ($row = fgetcsv($fp)) {
$data[] = $row;
}
fclose($fp);
array_pop($data);
$fp = fopen($csv_path, 'w+');
foreach($data as $key => $value) {
fputcsv($fp, $value);
}
} else {
throw new Exception("Failed to open file");
}
} catch (Exception $e) {
echo $e -> getMessage();
}?>