Reading large files from end

Question

Can I read a file in PHP from my end, for example if I want to read last 10-20 lines?

And, as I read, if the size of the file is more than 10mbs I start getting erro

Answer 1

If you know about how long the lines are, you can avoid a lot of the black magic and just grab a chunk of the end of the file.

I needed the last 15 lines from a very large log file, and altogether they were about 3000 characters. So I just grab the last 8000 bytes to be safe, then read the file as normal and take what I need from the end.

    $fh = fopen($file, "r");
    fseek($fh, -8192, SEEK_END);
    $lines = array();
    while($lines[] = fgets($fh)) {}

This is possibly even more efficient than the highest rated answer, which reads the file character by character, compares each character, and splits based on newline characters.