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<?php
/**
* @usage: used to offer safe file write operation in multiple threads context, arbitory file type
* @author: Rocky Zhang
* @time: Nov. 11 2009
* @demo[0]: $handler = mfopen($file, 'a+');
*        mfwrite($handler, $str);
*/
function mfopen($file, $mode='w+') {
    $tempfile = generateTempfile('./tempdir', $file);
    preg_match('/b/i', $mode) || ($mode .= 'b'); // 'b' is recommended
    if (preg_match('/\w|a/i', $mode) && !is_writable($file)) {
        exit("{$file} is not writable!");
    }
    $filemtime = $filemtime2 = 0;
    $tempdir = dirname($tempfile);
    is_dir($tempdir) || mkdir($tempdir, 0777);
    do { // do-while used to avoid modify in a long time copy
        clearstatcache();
        $filemtime = filemtime($file);
        copy($file, $tempfile);
        $filemtime2 = filemtime($file);
    } while ( ($filemtime2 - $filemtime) != 0 );
    if (!$handler = fopen($tempfile, $mode)) {
        exit('Fail on opening tempfile, write authentication is must on temporary dir!');
    }
    return array(0=>$handler, 1=>$filemtime, 2=>$file, 3=>$tempfile, 4=>$mode);
}
// I do think that this function should be optimized further
function mfwrite(&$handler, $str='') {
    if (strlen($str) > 0) {
        $num = fwrite($handler[0], $str);
      


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