Question

I am working on reading a file in php.
I need to read specific lines of the file.

I used this code:

fseek($file_handle,$start);
while (!feof($file_handle)) 
{   
    ///Get and read the line of the file pointed at.
    $line = fgets($file_handle);
    $lineArray .= $line."LINE_SEPARATOR";

    processLine($lineArray, $linecount, $logger, $xmlReply);

    $counter++;
}
fclose($file_handle);

However I realized that the fseek() takes the number of bytes and not the line number.

Does PHP have other function that bases its pointer in line numbers?

Or do I have to read the file from the start every time, and have a
counter until my desired line number is read?

I’m looking for an efficient algorithm, stepping over 500-1000 Kb file to get to the desired line seems inefficient.

Answer 1

Use SplFileObject::seek

$file = new SplFileObject('yourfile.txt');
$file->seek(123); // seek to line 124 (0-based)