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

Here is another solution. It doesn't have line length control in fgets(), you can add it.

/* Read file from end line by line */
$fp = fopen( dirname(__FILE__) . '\\some_file.txt', 'r');
$lines_read = 0;
$lines_to_read = 1000;
fseek($fp, 0, SEEK_END); //goto EOF
$eol_size = 2; // for windows is 2, rest is 1
$eol_char = "\r\n"; // mac=\r, unix=\n
while ($lines_read < $lines_to_read) {
    if (ftell($fp)==0) break; //break on BOF (beginning...)
    do {
            fseek($fp, -1, SEEK_CUR); //seek 1 by 1 char from EOF
        $eol = fgetc($fp) . fgetc($fp); //search for EOL (remove 1 fgetc if needed)
        fseek($fp, -$eol_size, SEEK_CUR); //go back for EOL
    } while ($eol != $eol_char && ftell($fp)>0 ); //check EOL and BOF

    $position = ftell($fp); //save current position
    if ($position != 0) fseek($fp, $eol_size, SEEK_CUR); //move for EOL
    echo fgets($fp); //read LINE or do whatever is needed
    fseek($fp, $position, SEEK_SET); //set current position
    $lines_read++;
}
fclose($fp);