Bug #70704 [Opn->Nab]: fputs

Edit report at https://bugs.php.net/bug.php?id=70704&edit=1 ID: 70704 Updated by: requinix@php.net Reported by: euanmee at gmail dot com Summary: fputs -Status: Open +Status: Not a bug Type: Bug -Package: Other web server +Package: Filesystem function related Operating System: Windows 7 Home Premium PHP Version: 5.5.30 Block user comment: N Private report: N New Comment: Option a) Use file_put_contents() with the append flag. That is atomic. Option b) Use file locking to prevent multiple instances of PHP from writing at the same time. A couple links to get you started: https://en.wikipedia.org/wiki/File_locking http://php.net/manual/en/function.flock.php And this reply wouldn't be complete without an obligatory Option C) Use a transactional database system instead of flat files. Previous Comments: ------------------------------------------------------------------------ [2015-10-13 00:58:35] euanmee at gmail dot com Description: ------------ PHP sometimes only writes part of the string to the disc. --- From manual page: http://www.php.net/function.fwrite --- I was originally using Mongoose Web Server - v5.5, with the PHP 5.5.10 supplied with it. I have now updated to 5.5.30 Three places in my code, I append data to a file. Occasionally, the first part of the write is not written, i.e. the write is not atomic. Windows 7 Home Premium, running Mongoose Web Server,using a Western Digital MyBookLive Duo (Debian + ext4) partition mounted as drive M: Test script: --------------- // from getBout.php $f = fopen("comps/$competitionId/$filename", "a"); // Write the new bout info fwrite($f, $toWrite); // Close the -status file fclose($f); // from getResults.php $f = fopen("comps/$competitionId/$filename", "a"); // Write the new bout info fwrite($f, $toWrite); // Close the -status file fclose($f); // from getScores.php $f = fopen("comps/$competitionId/$filename", "a"); // Write one bout's results fwrite($f, $toWrite); // fwrite($f, "boutScores[" . $currFencer2 . "][" . $currFencer1 . "] = " . $fencer2Num . ";\r\n") ; // Close the text file fclose($f); Expected result: ---------------- // from getBout.php, e.g. // Bout 2 currBout=2; currFencer1 = 3; currFencer2 = 4; // from getResults.php, e.g. /////////////////////////////////////////////////// // Bout 1 currBout=1; boutStartTimes[1] = '2015-10-12T07:47:58.401Z'; currFencer1 = 1; currFencer2 = 2; boutStarted[1][2] = true ; boutStarted[2][1] = true ; boutScores[1][2] = 3; boutScores[2][1] = 0; // from getScores.php, e.g. /////////////////////////////////////////////////// /////////////////////////////////////////////////// // Bout 1 over /////////////////////////////////////////////////// currBout=1; boutStartTimes[1] = '2015-10-12T07:47:58.401Z'; currFencer1 = 1; currFencer2 = 2; boutScores[1][2] = 10; boutScores[2][1] = 0; boutVictors[1][2] = 'V'; boutVictors[2][1] = 'L'; boutStarted[1][2] = true ; boutStarted[2][1] = true ; boutStartTimes[1] = '2015-10-12T07:47:58.401Z'; boutFinishTimes[1] = '2015-10-12T07:48:01.587Z'; /////////// /////////////// /////////// // from an earlier version e.g. currBout=1; boutStartTimes[1] = '2015-10-12T07:47:58.401Z'; Actual result: -------------- // from an earlier version e.g. 7:58.401Z'; // 37 characters missing from the intended string, in 0.03% of cases ------------------------------------------------------------------------ -- Edit this bug report at https://bugs.php.net/bug.php?id=70704&edit=1