From: rc at opelgt dot org Operating system: MacOSX 10.3 PHP version: 4.3.4 PHP Bug Type: Filesystem function related Bug description: Different behaviour of fopen depending on r+,w+,a+
Description: ------------ Hello, for my skill its a bit too much to understand whats going on here. Reproduce code: --------------- <?php $alt = '1234567890'; $neu = '13579'; $datei = 'test.txt'; $dh = fopen ($datei,"w"); fwrite($dh, $alt); fclose($dh); // pos1 $dh = fopen ($datei,"a+"); // just alter the mode to test others rewind($dh); echo "Inhalt<BR>\nalt: ".fread($dh, filesize($datei))."<BR>\n"; ftruncate($dh, '0'); fwrite($dh, $neu); rewind($dh); echo 'neu: '.fread($dh, filesize($datei)); fclose($dh); ?> Expected result: ---------------- I wrote the code above and exspected same behaviour for r+, w+ and a+. Before pos1 The content of 'test.txt' is written to '1234567890'. After pos1 the file is opened anothertime with r+,w+ or a+. Rewind sets the pointer to '0'. So that fread can read the file from the beginning. Ftruncate makes the size of the file to '0' and sets the pointer to the beginning of the file. Fwrite writes the new content and the size of the file will be as big as nessessary for the content. Rewind takes the pointer back from end to beginning of the file. Actual result: -------------- Echo should tell the new content. This only works with a+, but with r+ and w+ nothing is displayed. The first echo command tells the 'old' content in a+ and r+ mode, but not with w+. Seems to me there are undocumented differences between the modes that makes it difficult to choose and use one of them. R�diger -- Edit bug report at http://bugs.php.net/?id=28371&edit=1 -- Try a CVS snapshot (php4): http://bugs.php.net/fix.php?id=28371&r=trysnapshot4 Try a CVS snapshot (php5): http://bugs.php.net/fix.php?id=28371&r=trysnapshot5 Fixed in CVS: http://bugs.php.net/fix.php?id=28371&r=fixedcvs Fixed in release: http://bugs.php.net/fix.php?id=28371&r=alreadyfixed Need backtrace: http://bugs.php.net/fix.php?id=28371&r=needtrace Need Reproduce Script: http://bugs.php.net/fix.php?id=28371&r=needscript Try newer version: http://bugs.php.net/fix.php?id=28371&r=oldversion Not developer issue: http://bugs.php.net/fix.php?id=28371&r=support Expected behavior: http://bugs.php.net/fix.php?id=28371&r=notwrong Not enough info: http://bugs.php.net/fix.php?id=28371&r=notenoughinfo Submitted twice: http://bugs.php.net/fix.php?id=28371&r=submittedtwice register_globals: http://bugs.php.net/fix.php?id=28371&r=globals PHP 3 support discontinued: http://bugs.php.net/fix.php?id=28371&r=php3 Daylight Savings: http://bugs.php.net/fix.php?id=28371&r=dst IIS Stability: http://bugs.php.net/fix.php?id=28371&r=isapi Install GNU Sed: http://bugs.php.net/fix.php?id=28371&r=gnused Floating point limitations: http://bugs.php.net/fix.php?id=28371&r=float
