PHP获取文本文件的最后xx个字节？

Question

I have some text files that are very large - 100MB each that contain a single-line string (just 1 line). I want to extract the last xx bytes / characters from each of them. I know how to do this by reading them in a string and then searching by strpos() or substr() but that would require a large chunk of the RAM which isn't desirable for such a small action.

Is there any other way I can just extract, say, the last 50 bytes / characters of the text file in PHP before executing the search?

Thank you!

Answer 1

You can use fseek:

$fp = fopen('somefile.txt', 'r');
fseek($fp, -50, SEEK_END); // It needs to be negative
$data = fgets($fp, 50);