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