note 116885 added to function.ftell

When opening a file for reading and writing via fopen('file','a+') the file pointer should be at the end of the file. However ftell() returns int(0) even if the file is not empty. Also it seems that there is two pointers, first for reading and second for writing, because it acts differently on first operation (reading or writing). Example: <?php $file = fopen('counter.txt', 'w'); fwrite($file, '123456789'); fclose($file); $file = fopen('counter.txt', 'r'); echo ftell($file) . ' "' . fgets($file) . '" ' . ftell($file) . PHP_EOL; fclose($file); $file = fopen('counter.txt', 'a+'); echo ftell($file) . ' "' . fgets($file) . '" ' . ftell($file) . PHP_EOL; fclose($file); $file = fopen('counter.txt', 'r+'); fwrite($file, 'rr'); echo ftell($file) . ' "' . fgets($file) . '" ' . ftell($file) . PHP_EOL; fclose($file); $file = fopen('counter.txt', 'a+'); fwrite($file, 'aa'); echo ftell($file) . ' "' . fgets($file) . '" ' . ftell($file) . PHP_EOL; fclose($file); $file = fopen('counter.txt', 'r'); echo ftell($file) . ' "' . fgets($file) . '" ' . ftell($file) . PHP_EOL; fclose($file); ?> Result: 0 "123456789" 9 0 "123456789" 9 2 "3456789" 9 2 "" 2 0 "rr3456789aa" 11 ---- Server IP: 72.52.91.14 Probable Submitter: 79.133.227.85 ---- Manual Page -- http://php.net/manual/en/function.ftell.php Edit -- https://master.php.net/note/edit/116885 Del: integrated -- https://master.php.net/note/delete/116885/integrated Del: useless -- https://master.php.net/note/delete/116885/useless Del: bad code -- https://master.php.net/note/delete/116885/bad+code Del: spam -- https://master.php.net/note/delete/116885/spam Del: non-english -- https://master.php.net/note/delete/116885/non-english Del: in docs -- https://master.php.net/note/delete/116885/in+docs Del: other reasons-- https://master.php.net/note/delete/116885 Reject -- https://master.php.net/note/reject/116885 Search -- https://master.php.net/manage/user-notes.php