How to read a large file line by line?

Question

I want to read a file line by line, but without completely loading it in memory.

My file is too large to open in memory, and if try to do so I always get out of memo

Answer 1

The obvious answer wasn't there in all the responses.
PHP has a neat streaming delimiter parser available made for exactly that purpose.

$fp = fopen("/path/to/the/file", "r+");
while (($line = stream_get_line($fp, 1024 * 1024, "\n")) !== false) {
  echo $line;
}
fclose($fp);

Answer 2

One of the popular solutions to this question will have issues with the new line character. It can be fixed pretty easy with a simple str_replace.

$handle = fopen("some_file.txt", "r");
if ($handle) {
    while (($line = fgets($handle)) !== false) {
        $line = str_replace("\n", "", $line);
    }
    fclose($handle);
}