PHP: fopen() file pointer at the chosen line

Question

How to place a file pointer in the choosen line (e.g. 1 lime from the bottom) when opening file with fopen()?

Check this question out http://stackoverflow.com/questions/4718305/reading-a-specific-line-from-a-text-file — dee-see, Jan 18 '11 at 13:45

score 4 · Accepted Answer · answered Jan 18 '11 at 13:50

If you know the offset within the file of the data you want you could always fseek () to it. Of course the problem is discovering where you need to fseek to within the file. If you can use SEEK_END as an option then the offset will be relative to the end of the file instead of the beginning, which may be helpful for you.

Alternatively, you could use the file () function to load the file data into an array. Each element on the array represents a line of the file, so the second to last element in the array will be the item you want.

score 1 · Answer 2 · answered Aug 15 '17 at 07:34

1

There is a SplFileObject::seek method that can position the pointer to Nth line.

answered Aug 15 '17 at 07:34

Boy

1,182
2
11
28

score 1 · Answer 3 · answered Jan 18 '11 at 14:14

You will probably have to read your file counting line endings "\n". Something like:

function fseek_line($handle, $count) {
  while ((--$count > 0) && (fgets($handle, 4096) !== false)) { }
}

If you need the last line just open in append mode fopen("file.txt", "a");

score 0 · Answer 4 · edited May 23 '17 at 11:47

0

Unfortunatly there is no easy way for this. Since files are not stored linewise there is no order to jump one line or several.

But check out this thread: fseek() by line, not bytes?

edited May 23 '17 at 11:47

Community

1
1

answered Jan 18 '11 at 13:52

Mathias

2,484
1
19
17

PHP: fopen() file pointer at the chosen line

4 Answers4