Question

I am trying to do this exact function, only want to be able to display the last 20 lines of the document?

    $file = fopen("/tmp/$importedFile.csv","r");
    while ($line =  fgetcsv($file))
    {
        $i++;
        $body_data['csv_preview'][] = $line;
        if ($i > 20) break;
    }
    fclose($file);

I have tried changing the "r" in $file = fopen("/tmp/$importedFile.csv","r");however it seems there is only variations of where to put the pointer with read and write.

I feel this could be an easy one. my apologies.

Answer 1

One way to do this is to use an SqlFileObject. First, you need to know how many lines are in the file, which you can calculate like this:

$filename = "/tmp/$importedFile.csv";

// Create a new object for the file
$file = new SplFileObject( $filename, "r");

$lines = 0;
while ( !$file->eof()) {
   $file->fgets();
   $lines++;
}

Now you know there are $lines number of lines in the file. Then, you have to seek to the $lines - 20 line number, and read your CSV data until EOF, like this:

$file->seek( $lines - 20);
while ( !$file->eof()) { 
    $body_data['csv_preview'][] = $file->fgetcsv();
}

Perhaps there is a more efficient way to calculate $lines. Also, you should confirm that there is more than 20 lines in the file before attempting to seek() to $lines - 20.