note 81325 added to function.fopen

If you open a file with r+ and execute an fwrite(), writing less to the file than what it originally was, it will result in the difference being padded with the end of the file from the previous end of the file. Example: <? // Open file for read and string modification $file = "/test"; $fh = fopen($file, 'r+'); $contents = fread($fh, filesize($file)); $new_contents = str_replace("hello world", "hello", $contents); fclose($fh); // Open file to write $fh = fopen($file, 'r+'); fwrite($fh, $new_contents); fclose($fh); ?> If the end of the file was "abcdefghij", you will notice that the difference in "hello world" and "hello", 6 characters, will be appended to the file, resulting in the new ending: "efghij". To obviate this, fopen() with +w instead, which truncates the file to zero length. ---- Server IP: 69.147.83.197 Probable Submitter: 128.192.32.117 ---- Manual Page -- http://www.php.net/manual/en/function.fopen.php Edit -- https://master.php.net/note/edit/81325 Del: integrated -- https://master.php.net/note/delete/81325/integrated Del: useless -- https://master.php.net/note/delete/81325/useless Del: bad code -- https://master.php.net/note/delete/81325/bad+code Del: spam -- https://master.php.net/note/delete/81325/spam Del: non-english -- https://master.php.net/note/delete/81325/non-english Del: in docs -- https://master.php.net/note/delete/81325/in+docs Del: other reasons-- https://master.php.net/note/delete/81325 Reject -- https://master.php.net/note/reject/81325 Search -- https://master.php.net/manage/user-notes.php