#40183 [Opn->Bgs]: fopen() for appending does not move position until first I/O

ID: 40183 Updated by: iliaa@php.net Reported By: perrog at gmail dot com -Status: Open +Status: Bogus Bug Type: Filesystem function related Operating System: Mac OS X 10.4 PHP Version: 5.2.1RC3 New Comment: Thank you for taking the time to write to us, but this is not a bug. Please double-check the documentation available at http://www.php.net/manual/ and the instructions on how to report a bug at http://bugs.php.net/how-to-report.php The initial position returned is 0 because counting starts from the append position (earlier data does not count). Previous Comments: ------------------------------------------------------------------------ [2007-01-21 07:26:48] perrog at gmail dot com Description: ------------ Opening a file for appending does not move the file pointer to the end of file before the first I/O operation is performed. That makes ftell() return zero directly after the fopen() call. The workaround, if you need to call ftell() immediately after the fopen(), is to use a no-operation I/O call fseek() that don't do anything. Thus, the file pointer is updated and returns correct position information. Reproduce code: --------------- // create or open a file, and write some stuff to it. $filename = "/path/to/file.txt"; $fp = fopen($filename, "a+"); fwrite($fp, "Sample text"); fclose($fp); // re-open it and check what ftell() returns $fp = fopen($filename, "a+"); echo " pre-fseek: " . ftell($fp) . "\n"; // ftell returns 0 fseek($fp, 0, SEEK_END); echo "post-fseek: " . ftell($fp) . "\n"; // ftell now ok Expected result: ---------------- The snippet should print the file size of the file: pre-fseek: 11 post-fseek: 11 Actual result: -------------- The snippet should print the correct file size only after the first I/O operation: pre-fseek: 0 post-fseek: 11 ------------------------------------------------------------------------ -- Edit this bug report at http://bugs.php.net/?id=40183&edit=1